The patch-level land use labels are extended from their prior values of
only primary or secondary lands to also include pasture, rangeland, and
crops. Land use change in FATES is treated as a disturbance rate (in
area/time units) from existing patches with a given land use label to
new patches with the new land use label. Thus a fourtg distinct type
of disturbances is added to the existing treefall, fire, and logging
types.

The driving data for this run mode is from the Land Use Harmonization 2
state and transition datasets.  The workflow tool for processing this
input was previously developed with pull request #1032.