Changeset 1243

number of individuals is now a prognostic variable for all woody PFTs and woody PFTs are calculated for different diameter classes. All seems to work for multiple years for the woody PFTs except for the fire module which should be rewritten to make use of the different diameter classes. Grasses and crops are not properly working yet. Note that none of the parameters have been checked. They just happen to work from a numerical point of view