Moved group loops from fspSolver to sweeper, since the later sweep routine will likely be doing that anyways.   This will allow the base routine in sweeper.f90 to remain untouched despite changes to openacc and openmp.
Added ability to change solvers from commandline.  The executable takes 2 inputs.  The first is the case name, as before.  The second is an integer, indicating the solverType.  For additional solvers, add a new value in IO, and and expand the SELECTCASE in fspSolver.  If no value is given on the commandline, it defaults to BASESOLVER, which is a value of 1 and corresponds to the sweep2D_prodquad routine in sweeper.f90.
Renamed aaron_main.f90 to EXACTISH.f90.  Removed jipu_main.f90.  With the capability to use change sweepers from commandline, having 2 executables was pretty pointless.  The makefile was updated accordingly.