make partial reads work, modularize UVCal selection code

Add testing!

docs/conf.py

@@ -69,6 +69,7 @@
     ("UVH5", "params_style"),
     ("MWA FITS", "params_style"),
     ("MIR", "params_style"),
+    ("CalH5", "params_style"),
 ]
 
 # Add any paths that contain templates here, relative to this directory.

pyuvdata/hdf5_utils.py

@@ -2,6 +2,8 @@
 # Copyright (c) 2023 Radio Astronomy Software Group
 # Licensed under the 2-clause BSD License
 """Utilities for working with HDF5 files."""
+from __future__ import annotations
+
 from functools import cached_property
 from pathlib import Path
 from typing import Any

pyuvdata/parameter.py

@@ -496,7 +496,7 @@ def __eq__(self, other, *, silent=False):
                     if not silent:
                         print(
                             f"{self.name} parameter value is not an array, "
-                            "but other is not"
+                            "but other is an array"
                         )
                     return False
                 try: