Make a few small changes to EXACT-ISH

1.  Add TARGET attribute to mySweeper
2.  Added TYPE(fspSolverType) :: mySolver
3,  Added initialization call for mySolver
Added igstt and igstp to sweeperType
Add assignment of igstt and igstp on sweeperType in IO
Add skeleton for fspSolverType and initialize() routine
Fill in some code for initializeFspSolver
Add initializeSweeper routine and make two members of sweeperType POINTER instead of ALLOCATABLE
Initialize qi1g(:) to NULL() by default on SourceType_P0
Add IMPLICIT NONE to EXACT-ISH
Add step method to fspSolver
Add commented out calcFissionSrc method
Add Sourcetype interfaces for computeMGFS and updateInScatter
Add call to FSP solve
Add solveFspSolver method to FspSolveType
Fix segfault problems in sweeper

1. Needed allocate qextmg and qi1g on source.
2. Needed to associate the sweep and setExtSource procedure pointers.
3. Also added a TODO statement about calcMacroChi