477 add princeton met forcing

[ccarouge]

CABLE

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Description

Add the Princeton forcing as part of the changes brought by the groundwater work. The implementation follows the way it was initially done for the groundwater with the following differences:

• adaptation to the refactoring of the driver
• bug fixed in renameFiles_Princeton() (added the "BACK" keyword to INDEX() call) and modification in cable_input since Princeton does not provide a file for snowfall.

Fixes #477

Type of change

Please delete options that are not relevant.

• New

Checklist

• The new content is accessible and located in the appropriate section.
• I have checked that links are valid and point to the intended content.
• I have checked my code/text and corrected any misspellings

Testing

When running with the Princeton forcing on for the year 1948, I have tested that the forcings output by CABLE are identical to the values in the input files. This is true except for the pressure variable. This variable goes through a unit conversion (Pa to hPa) and type conversions (double to real). This introduce a small noise in the comparison with a maximum difference of 0.008 Pa that is negligible.

Please add a reviewer when ready for review.

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📚 Documentation preview 📚: https://cable--524.org.readthedocs.build/en/524/

[ccarouge]

@ccarouge might need something more. See l.877 in the GW PR.
There should be something for the output as well, see l. 989 in the GW PR.