ENH: CoordinateImage API

[effigies]

Along with #1084, replaces #1056.

Starting with some basic implementations in test directory. Next step is to write some API unit tests to clarify expected behavior and code some specific implementations toward those tests.

Will close #1056 once I've taken all comments into account.

[pep8speaks]

Hello @effigies, Thank you for updating!

• In the file nibabel/cifti2/cifti2.py:

Line 34:1: F811 redefinition of unused 'Recoder' from line 33
Line 35:1: F811 redefinition of unused 'warn' from line 22

To test for issues locally, pip install flake8 and then run flake8 nibabel.

Comment last updated at 2022-08-31 00:48:00 UTC

[codecov]

Codecov Report

Attention: Patch coverage is 34.81781% with 322 lines in your changes missing coverage. Please review.

Project coverage is 93.90%. Comparing base (9d66d8a) to head (20f71df).

Files with missing lines	Patch %	Lines
nibabel/tests/test_pointset.py	21.19%	119 Missing ⚠️
nibabel/coordimage.py	25.00%	81 Missing ⚠️
nibabel/cifti2/caretspec.py	58.33%	41 Missing and 9 partials ⚠️
nibabel/tests/test_coordimage.py	13.46%	45 Missing ⚠️
nibabel/pointset.py	51.35%	18 Missing ⚠️
nibabel/cifti2/tests/test_caretspec.py	65.38%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1090      +/-   ##
==========================================
- Coverage   95.34%   93.90%   -1.44%     
==========================================
  Files         208      212       +4     
  Lines       29768    30259     +491     
  Branches     3355     3420      +65     
==========================================
+ Hits        28381    28415      +34     
- Misses        948     1397     +449     
- Partials      439      447       +8     

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