Implement grass allometric equations and update default allometric parameters for grass PFT #1206

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3 tasks still to be completed

Task	Status
[ x ] The in-code documentation has been updated with descriptive comments	Incomplete
The documentation has been assessed to determine if updates are necessary	Incomplete
FATES PASS/FAIL regression tests were run	Incomplete
Evaluation of test results for answer changes was performed and results provided	Incomplete
Technical Note update:	Incomplete
User's Guide update:	Incomplete
Many of these modes (especially for crown area and leaf/AG biomass) really could be simplified into 1 generic allometric mode. This may make the code a bit simpler overall.	Incomplete
All the derivatives are fine, but in most cases, it could be rewritten in terms of the biomass itself, which saves come floating point operations. I've done this for a few allometric modes. I don't think it's high priority because it's not something computed multiple times a day, but it could save a few milliseconds ;).	Incomplete