Some more changes for raster comparision

Fixed the wrong variable definitions for raster signals. raster signals not be arrays!

Adding the Macros/mapedit_rasterbcm.pl for converting ENGINE type channel map files to HCAN type map files. I initially added this script to hcana/examples. But I realize the better location for it is the hcana_replay directory.

Adding  Macros/comp_beam_engine_hcana.C to generate plots for raster signal comparison. For each signal, the script will generate an overlayed histogram and a difference histogram.