extension by parts
benzene only working
benzene only 100 cells
biomass changing ok, o2 increasing
benzene, o2, so4
added btx, seems to work
Merge branch 'benzeneonly'
The merge benzeneonly was tested for BTX and O2/SO4. It was merged with the main branch to be tested
against the bionapl version. All generalizations were commented out.

Conflicts:
	src/phf.f90