JSON formatted parameter files.

Adding demotion/promotion protections

Improved handling of negative and near zero cohort sizes.  Addresses

Fixes issue negative tree lai issue

May come up in cases in which we have a tiny leafc_per_unit_area

Updates and fixes to site-level mass tracking.

Corrections to wind speed unit comments

fix calculation of the distance between model grid and inventory sites

Adopts the use of the great circle distance function

Secondary young fraction bug fix

Fixes #1478

This changes how we regulate root proportions, such that in CNP mode …

…root proportions are not allowed to change while both N and P are supplementing. This was introduced by Bharat Sharma.

Event based mortality fixes.

Refactors of radiation error tracking and radiation profile diagnostics.