NetCDF exports when in validate mode don't contain timeseries data and are intended to generate files containing supported package input data. This update makes this more explicit by adding a input suffix identifier to the export.

For a model named "rch", a typical NetCDF export would be named "rch.nc". With this change, if running in validate mode, the export would be named "rch.in.nc".

The primary benefit of this change is that it avoids file name collisions if a user generates an input file in validate mode and then directly uses the file as a NetCDF input while also trying to generate a new timeseries export (with the same name).

Checklist of items for pull request

• Replaced section above with description of pull request
• Formatted new and modified Fortran source files with fprettify
• Removed checklist items not relevant to this pull request

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