Replaced models/petsc3.4/ocmipabiotic with models/petsc3.4/ocmipabioticcarbon.
ocmipabioticcarbon is a cleaned-up version of the former. The main change is
changes in DIC and DIC14 concentration due to E-P are now always calculated
(-use_emp has been deprecated). By default the local, instantaneous concentration
is used to compute this term, but you can revert to the previous (OCMIP) option
of using the global surface mean value via the -use_virtual_flux option.

Changes to be committed:
  deleted:    ocmipabiotic/
  added:      ocmipabioticcarbon/