IMAX effect integration

[lowderchris]

I've migrated some of the IMAX effect code from punchbowl to here in solpolpy directly. A punchbowl branch exists utilizing these changes, which can be pulled in once this pull request is resolved. Definitely let me know of any changes I can make here to improve. See any TODOs for outstanding questions I can wrap up.

• mark imax effect as done in readme.md

[codecov]

Codecov Report

Attention: Patch coverage is 88.57143% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 93.13%. Comparing base (be001f8) to head (5fb2eb1).
Report is 14 commits behind head on develop.

Files	Patch %	Lines
solpolpy/core.py	88.57%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #98      +/-   ##
===========================================
- Coverage    93.51%   93.13%   -0.38%     
===========================================
  Files            9        9              
  Lines          447      481      +34     
===========================================
+ Hits           418      448      +30     
- Misses          29       33       +4     

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[jmbhughes]

@s0larish could you take a look at the TODOs @lowderchris left in the code? We should make sure we have answers to those before merging.

[jmbhughes]

I would like to see more tests. Is there a simple test case for IMAX matrix we can generate to actually check the values? We need to make sure the matrix is properly constructed. Or could we make sure its output is different when its applied than not applied. It would be particularly nice if the ratio of output with and without the IMAX effect has a nice property we can check for. I'm just brainstorming some tests here.

[jmbhughes]

Almost there. These should be easy things to fix I think.