Latest Scipp (Dataset -> DataGroup)

[andped10]

Python 3.8 is no longer supported.

• The latest version of scipp does not support python 3.8.

For the latest version of scipp to work we need to exchange the usage of Datasets to DataGroups.

• The reason being that a Dataset now requires that dims (name and size) is equal for all the contained data.

A main difference between a dataset and a datagroup is that a datagroup doesn't have the same attributes. Instead the structure of the datagroup is more dictionary like.

Syntax has also been changed to only having one argument per line for method calls the extend over several lines.

Loops solely relying on the dictionary keys have been changed from key, value in dict.items(): to key in dict.keys():

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (eab0d31) 97.86% compared to head (d89117e) 97.86%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #66   +/-   ##
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  Coverage    97.86%   97.86%           
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  Files           41       41           
  Lines         3050     3050           
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  Hits          2985     2985           
  Misses          65       65           

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[rozyczko]

Replacing DataArray with DataGroup is thorough.
The code is ready to be merged but please clear/reset monolayer.ipynb - it's got all the output cells and this makes the file unnecessarily large.