ENH: Adopt PEP518 and PEP631

Adopt PEP518 to specify minimum build system requirements for the
package.

Partially comply with PEP631:
- Dependencies are now stored in the `pyproject.toml` file, including
  packages that are not in PyPI (e.g. source code URLs -GitHub, etc.),
  so the related requirements file is removed.

Require `setuptools >= 66` so that the package can be effectively
installed in editable mode when using the minimum required version of
it. Avoids:
```
ERROR:
 Project file:///home/runner/work/whitematteranalysis/whitematteranalysis
 has a 'pyproject.toml' and its build backend is missing the
 'build_editable' hook. Since it does not have a 'setup.py' nor a
 'setup.cfg', it cannot be installed in editable mode. Consider using a
 build backend that supports PEP 660.
```

Require `nibabel > 3.0.0` to avoid:
```
  File "bin/wm_cluster_volumetric_measurements.py", line 7, in <module>
    import nibabel as nib
  File "python3.10/site-packages/nibabel/__init__.py", line 66, in <module>
(...)
AttributeError: module 'numpy' has no attribute 'float'.
`np.float` was a deprecated alias for the builtin `float`.
 To avoid this error in existing code, use `float` by itself. Doing this
 will not modify any behavior and is safe. If you specifically wanted
 the numpy scalar type, use `np.float64` here.
The aliases was originally deprecated in NumPy 1.20; for more details
 and guidance see the original release note at:
https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations. Did you mean: 'cfloat'?
```

Require `"scipy >= 1.7.0` for `python_version == '3.9'` to avoid:
```
whitematteranalysis/cluster.py:14: in <module>
    import scipy.cluster.hierarchy
(...)
python3.9/site-packages/scipy/special/orthogonal.py:79: in <module>
    from numpy import (exp, inf, pi, sqrt, floor, sin, cos, around, int,
E   ImportError: cannot import name 'int' from 'numpy'
(python3.9/site-packages/numpy/__init__.py)
```

Require `statsmodels >= 0.14.0` to avoid:
```
ModuleNotFoundError: No module named 'statsmodels'
```

when using the minimum required version builds.

Require `vtk>=9.2.2` for `python_version == '3.9'` to avoid:

```
import vtk
ModuleNotFoundError: No module named 'vtk'
```

Require `vtk>=9.2.2` for `python_version >= '3.10'` to avoid:
```
ERROR: Could not find a version that satisfies the requirement
 vtk==9.2.0
 (from versions: 9.2.2, 9.2.4, 9.2.5, 9.2.6, 9.3.0rc1, 9.3.0rc2, 9.3.0, 9.3.20230807rc0)
ERROR: No matching distribution found for vtk==9.2.0
```

and `vtk>=9.2.4` for Python 3.11 to avoid:
```
  File "whitematteranalysis/cluster.py", line 16, in <module>
    import vtk
ModuleNotFoundError: No module named 'vtk'
```

List `importlib-resources` as a dependency explicitly to avoid Python
3.9 not finding the package.

Use `float` instad of `np.float` in `tract_measurement.py`. Fixes:
```
AttributeError: module 'numpy' has no attribute 'float'.
`np.float` was a deprecated alias for the builtin `float`. To avoid
this error in existing code, use `float` by itself. Doing this will not
modify any behavior and is safe. If you specifically wanted the numpy
scalar type, use `np.float64` here.
```

Adapt the Sphinx documentation config file to read the necessary
metadata from the `pyproject.toml` file.

Add the `tomli` package to the documentation dependencies so that
`readthedocs` can successfully find it.

Prepend the module location to the script testing `script_runner.run`
calls.

Adopt `tox.ini` for testing automation and standardization.

Adapt the GitHub Actions workflow accordingly

Do not use the `--doctest-modules` for now to avoid:
```
_____________________ ERROR collecting docs/source/conf.py _____________________
E   FileNotFoundError: [Errno 2] No such file or directory: '../../pyproject.toml'
```

Documentation:
https://www.python.org/dev/peps/pep-0518/
https://www.python.org/dev/peps/pep-0631/

Author: jhlegarreta

.github/workflows/test_package.yaml

@@ -28,9 +28,7 @@ jobs:
     - name: Set min. dependencies
       if: matrix.requires == 'minimal'
       run: |
-        python -c "req = open('requirements.txt').read().replace(' >= ', ' == ') ; open('requirements.txt', 'w').write(req)"
-        python -c "req = open('requirements_dev.txt').read().replace(' >= ', ' == ') ; open('requirements_dev.txt', 'w').write(req)"
-        python -c "req = open('setup.py').read().replace(' >= ', ' == ') ; open('setup.py', 'w').write(req)"
+        python -c "req = open('pyproject.toml').read().replace(' >= ', ' == ') ; open('pyproject.toml', 'w').write(req)"
 
     # - name: Cache pip
     #   uses: actions/cache@v2
@@ -45,18 +43,24 @@ jobs:
     - name: Install dependencies
       # if: steps.cache.outputs.cache-hit != 'true'
       run: |
-        python -m pip install --upgrade --user pip setuptools pytest-cov
-        pip install -r requirements_dev.txt
+        # SKLEARN_ALLOW_DEPRECATED_SKLEARN_PACKAGE_INSTALL required due to
+        # some dependency listing "scikit-learn" as "sklearn" in its dependencies
+        export SKLEARN_ALLOW_DEPRECATED_SKLEARN_PACKAGE_INSTALL=True
+        python -m pip install --upgrade --user pip
+        pip install setuptools tox
+        pip install -e .[test]
         python --version
         pip --version
         pip list
 
     - name: Run tests
       run: |
-        # tox --sitepackages
-        pip install -e .
+        # Test with tox
+        tox --sitepackages
+        # Test with pytest
         python -c 'import whitematteranalysis'
-        coverage run --source whitematteranalysis -m pytest -o junit_family=xunit2 -v --doctest-modules --junitxml=junit/test-results-${{ runner.os }}-${{ matrix.python-version }}.xml
+        coverage run --source whitematteranalysis -m pytest -o junit_family=xunit2 -v --junitxml=junit/test-results-${{ runner.os }}-${{ matrix.python-version }}.xml
+        # coverage run --source whitematteranalysis -m pytest -o junit_family=xunit2 -v --doctest-modules --junitxml=junit/test-results-${{ runner.os }}-${{ matrix.python-version }}.xml
 
     - name: Upload pytest test results
       uses: actions/upload-artifact@master
@@ -74,9 +78,9 @@ jobs:
     - name: Package Setup
     # - name: Run tests with tox
       run: |
-        # pip install build
+        pip install build
         # check-manifest
-        python setup.py install
+        python -m build
         # twine check dist/
         # tox --sitepackages
         # python -m tox

bin/tests/test_harden_transform_with_slicer.py

@@ -2,5 +2,5 @@
 # -*- coding: utf-8 -*-
 
 def test_help_option(script_runner):
-    ret = script_runner.run(["harden_transform_with_slicer.py", "--help"])
+    ret = script_runner.run(["bin/harden_transform_with_slicer.py", "--help"])
     assert ret.success

bin/tests/test_wm_append_clusters.py

@@ -2,5 +2,5 @@
 # -*- coding: utf-8 -*-
 
 def test_help_option(script_runner):
-    ret = script_runner.run(["wm_append_clusters.py", "--help"])
+    ret = script_runner.run(["bin/wm_append_clusters.py", "--help"])
     assert ret.success

bin/tests/test_wm_append_clusters_to_anatomical_tracts.py

@@ -3,5 +3,5 @@
 
 def test_help_option(script_runner):
     ret = script_runner.run(
-        ["wm_append_clusters_to_anatomical_tracts.py", "--help"])
+        ["bin/wm_append_clusters_to_anatomical_tracts.py", "--help"])
     assert ret.success

bin/tests/test_wm_append_diffusion_measures_across_subjects.py

@@ -3,5 +3,5 @@
 
 def test_help_option(script_runner):
     ret = script_runner.run(
-        ["wm_append_diffusion_measures_across_subjects.py", "--help"])
+        ["bin/wm_append_diffusion_measures_across_subjects.py", "--help"])
     assert ret.success

bin/tests/test_wm_assess_cluster_location_by_hemisphere.py

@@ -3,5 +3,5 @@
 
 def test_help_option(script_runner):
     ret = script_runner.run(
-        ["wm_assess_cluster_location_by_hemisphere.py", "--help"])
+        ["bin/wm_assess_cluster_location_by_hemisphere.py", "--help"])
     assert ret.success

bin/tests/test_wm_average_tract_measures.py

@@ -2,5 +2,5 @@
 # -*- coding: utf-8 -*-
 
 def test_help_option(script_runner):
-    ret = script_runner.run(["wm_average_tract_measures.py", "--help"])
+    ret = script_runner.run(["bin/wm_average_tract_measures.py", "--help"])
     assert ret.success

bin/tests/test_wm_change_nrrd_dir.py

@@ -2,5 +2,5 @@
 # -*- coding: utf-8 -*-
 
 def test_help_option(script_runner):
-    ret = script_runner.run(["wm_change_nrrd_dir.py", "--help"])
+    ret = script_runner.run(["bin/wm_change_nrrd_dir.py", "--help"])
     assert ret.success

bin/tests/test_wm_cluster_from_atlas.py

@@ -2,7 +2,7 @@
 # -*- coding: utf-8 -*-
 
 def test_help_option(script_runner):
-    ret = script_runner.run(["wm_cluster_from_atlas.py", "--help"])
+    ret = script_runner.run(["bin/wm_cluster_from_atlas.py", "--help"])
     assert ret.success
 
 

bin/tests/test_wm_cluster_remove_outliers.py

@@ -2,7 +2,7 @@
 # -*- coding: utf-8 -*-
 
 def test_help_option(script_runner):
-    ret = script_runner.run(["wm_cluster_remove_outliers.py", "--help"])
+    ret = script_runner.run(["bin/wm_cluster_remove_outliers.py", "--help"])
     assert ret.success