Switching to a setup for generalized single film

Generalizing the GS20Calibration to switch to a generalized single film.
Renamed main files

Renamed to main files to be more generic.
Changed naming

Changed the namening. For some reason there it isn't compiling on the
iMac.
Updated Readme
Working on adding material

Working on adding the PS detector, EJ426, and adding for the detector
constrution.
Set the Birks constant, cleaned up compile

Set the Birk constnat by mostly trial and error, and updated some of the
run scripts.
Added different materials

Added different to the messeneger and the dector construction.
Increased run size

Increased the run size of the files.
Removed BirksConstant Effect

Removed the simulation of the birks constant effect. This simulation
never worked.
Merge branch 'PSDetLightVal' into LightVal
Changed Histogram Output name

Changed the histogram output name to not be GS20 specific
Removed optical GEANT4 Example

Removed the optical example templates provided with GEANT4
Added PS and GS20 to runs and analysis

Added a GS20 and PS film to the run and the analysis.