Added EXPT_Linear routine, some basic counters on a variety of classes, and a definition for PI
Filled in sweep2D_prodquad_P0 routine
Added a few more READ statements that I missed earlier
Added updated pincell_1g.dump.  The case runs to completion, so hopefully this is the final version.
Fixing some bugs in the sweeper initialization and adding a dump of phis1g to external file
Added reading of psi.  Fixed allocation of xsmacchi and angular flux boundary conditions.  Added validate() subroutine
Style updates to fspSolver
Added call to validate() and removed 'Hello World' message
Updating pincell_1g.dump.  There was a bad index in the cross section dump in MPACT.  Also added dump of region volumes.
Simplifying pincell_1g.sol to only have the region/group-wise scalar flux instead of the segment-wise angular flux, as before.