Added the use of old solver when using only one MPI rank
Merge branch 'master' of https://github.com/alexlongne/parpetro
Fixed some bugs, residuals are the same in serial and parallel! Whooo!
Merge branch 'master' of https://github.com/alexlongne/parpetro

Conflicts:
	new-src/FTSim_Executive.f90
	new-src/FTSim_Main.f90
	new-src/FTSim_Parallel.f90