Minor updates to inventory input and error reporting

[mpaiao]

Very minor updates to the inventory initialisation, that should have no impact on simulations.

Description:

This fixes a couple of minor issues that shouldn't affect any simulations at this point.

1. Land use index should be an integer (currently not used, but it may be useful in the future).
2. Updated debugging reporting formats, so they are consistent with the variables being reported.

Collaborators:

Expectation of Answer Changes:

Checklist

If this is your first time contributing, please read the CONTRIBUTING document.

All checklist items must be checked to enable merging this pull request:

Contributor

• [ ] The in-code documentation has been updated with descriptive comments
• [ ] The documentation has been assessed to determine if updates are necessary

Integrator

• [ ] FATES PASS/FAIL regression tests were run
• [ ] Evaluation of test results for answer changes was performed and results provided

Documentation

• Technical Note update:
• User's Guide update:

Test Results:

CTSM (or) E3SM (specify which) test hash-tag:

CTSM (or) E3SM (specify which) baseline hash-tag:

FATES baseline hash-tag:

Test Output:

[glemieux]

Regression testing against fates-sci.1.76.1_api.35.1.0-ctsm5.2.004 shows all expected tests passing b4b. Note that this was tested in tandem with #1186.

results: /glade/u/home/glemieux/scratch/ctsm-tests/tests_pr1191-1186-fates