Better errormsg for compsets

[jedwards4b]

Improve error messages for compset match

Test suite: scripts_regression_tests.py
Test baseline:
Test namelist changes:
Test status: bit for bit
Fixes #1860
Fixes #1859
User interface changes?:

Update gh-pages html (Y/N)?:

Code review:

[billsacks]

Thank you for this - this is definitely an improvement.

For use cases (1) and (2) in #1860 would it be possible to print out the portion of the compset string in error? i.e., for use case (1) the error message should explicitly call out "DATM2%NYF" as the portion in error, and for use case (2) the error message should explicitly call out "DATM%FOO" as the portion in error. With some careful reading, it's now possible to deduce this from the current error messages, but I feel it would help users if this were called out very clearly.

But if that's hard to do for some reason, I can let it go.

[jedwards4b]

I didn't see a straightforward way to do that.

[billsacks]

Okay, thanks for looking and thanks for your work on this.