Initial commit of GS20 Calibration

Initial commit of the GS20 calibration with a light calibration folder.
Added histogram manager

Added the histogram manager (using three histograms, all TH1F)
Reworked Analysis Class

Rewrked the analysis class to use the histomanager.  I may be getting
good at this . . .
Added Macros to CMake

Added the macros to the CMakeList.txt file, while putting the commands
for activiting the analysis in the simulation.
Added Birks Parameter

Added the Birks light quenching parameter (for GSO, but come on, GS20
can't be that much differnet . . .)
Remvoed excessive print statements

Removed the excessive print statments.
Trials for histogram bins

Playing with short runs for the histogram bins
Added Rank of MPI to analysis

Added the rank of the MPI run to the analysis class. Following the
example of the MPI examples, exMPI02
Added MPI directive to CMakeLists

Added the MPI directive to the CMakeLists.  I also want to make the
compilation / use of the MPI manager optional.
Added the g4MPI libraries, now compiles

I added the G4MPI libraries to the CMake and it now compiles! Yay!
Increased the runs

Increased the run number
Updated the README

Adding the hadd to the README.  This readme is quite far behind.
Trying to do a LayeredDetectorCalibration

I want to do a layered detector calibration and a little work on a
single scintillating bar (probably wls example based)
Working on simple scintillation slab

Working on a simple simulation of a scintillating slab.
Simplified detector and geometry
Using the WLS hit and SD

Using the WLS hit and SD.  I don't need all of the information of mine,
and they have some timing information.
Changed the indentation
Fixed small compile errors
Added a generic analysis
Removed the analysis Messenger