Finish fixing CRS management (ISS317 part 2)

[nrweir]

Description

The initial PR for this subject (#319) didn't quite resolve all of the problems. This PR finishes it. Fixes #317

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected - these changes will not be merged until major releases!)

How Has This Been Tested?

Please describe tests that you added to the pytest codebase (if applicable).

Checklist:

• [x] My PR has a descriptive title
• [x] My code follows PEP8
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new errors
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] My PR passes Travis CI tests
• [x] My PR does not reduce coverage in Codecov

If your PR does not fulfill all of the requirements in the checklist above, that's OK! Just prepend [WIP] to the PR title until they are all satisfied. If you need help, @-mention a maintainer and/or add the Status: Help Needed label.

[codecov[bot]]

Codecov Report

Merging #322 into dev will decrease coverage by <.01%. The diff coverage is 66.66%.

@@            Coverage Diff             @@
##              dev     #322      +/-   ##
==========================================
- Coverage   67.16%   67.15%   -0.01%     
==========================================
  Files          72       72              
  Lines        5196     5204       +8     
==========================================
+ Hits         3490     3495       +5     
- Misses       1706     1709       +3

Impacted Files	Coverage Δ
solaris/utils/core.py	73.56% <66.66%> (-1.13%)	:arrow_down:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 267d269...eca4c91. Read the comment docs.