Fixed error with unfinished if statement in GAcquTreeManager
Added central and veto indeces to the tree input/output
Added check for minimum number of daughters when running first level of MesonReconstruction, otherwise can sometimes return a meson from a single particle
Fixed PDG code issue in Pi0 class
Added rough manual - work in progress
Added library flag to CMakeLists
Renamed example physics classes
Additional changes to rename example physics classes
Added PDG database to example physics class
Improved writing of histograms (default to write all open histograms)
Simplified PEtaExample with command line processing
Corrected error typo
Removed Compton example config, included Eta example config
Set default config example for Eta analysis in GoAT
Removed typo in PEtaExample
Added check for existing output files in directory running, and a flag to not overwrite them
Fixed output file check for instances where a seperate output directory was chosen
Simplified example Pi0 class
Renamed manual folder to documents
Added man page for goat

Added man page for running goat. Man page can be invoked two ways: if goat is run with no flags, or with the flag -help, a man page is opened.