met2model.BIOCRO: Close all years of input

[infotroph]

Fixes #2485

The lack of @export on close_nc_if_open is intentional -- I think there's a chance but not a certainty that it could be useful to other packages, and it's much easier to export it (probably from a different package) if we need it later than it is to remove an exported function if we change our mind about it.

Review Time Estimate

• Immediately
• Within one week
• When possible

Types of changes

• 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 change)

Checklist:

• My change requires a change to the documentation.
• I have updated the CHANGELOG.md.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.