Correction of inconsistant NULL markers

Each apparatus/detector in Acqu uses some inconsistant NULL markers to signify that no hit or energy deposit was found for a given track. These values are some large +ve or -ve large values (greater than e6). It is fully appropriate to store a value of 0.0 for an energy deposition (instead of +1e9) when no deposition is recorded. This standard has now been applied to data stored in the output tree of TA2GoAT.
Data Folder update (2012.12)

Added multi-hit Tagger (set to maximum of 8) as well as added a generic 'scratch' directory for the server setup file.
Finish macro for multi-thread Acqu Analysis

Finish macro which appends input file name to the output file. This is primarily helpful for analysis with Worker. An output directory can be specified, if none is specified the global output directory (defined in AR.dat) is used. If this is also unspecified, the users home directory is used as a default.
Switch to multi-thread Finish Macro in config
Worker: Added option for maximum threads that are started; changed handling of thread negotiation from random numbers to job pids and considering the started threads
Updated BaF2 detector name in Pi0Compton class
Improved set of Monte Carlo configs... again

I have again updated the 'standard' MC configs. Lines like 'Energy-Scale' are required for MC data otherwise the resulting physics distributions will not be comparable to real data. I have set values such that the invariant mass of simulated neutral pion invariant mass reconstructs normally. I then checked a missing mass and the reconstruction looks normal.