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)