Scaler replay and online GUI

Added files
------------
DBASE/db_HSScalerevt.dat : scaler database for HMS
DBASE/db_PSScalerevt.dat : scaler database for SHMS
DBASE/make_scaler_db.py  : Python script to make HMS and SHMS
                           database files from xscaler scaler.map
SCRIPTS/HMS/replay_hms_scalers.C : script to replay HMS scalers only
SCRIPTS/SHMS/replay_shms_scalers.C : script to replay SHMS scalers only
DEF-files/HMS/EPICS/epics_short.def : List of EPICS variables to include in Tree
                                      used in scaler scripts as an example
onlineGUI/Config/hms_scaler.cfg  : configuration file to plot HMS scalers
onlineGUI/Macros/plot_hms_scaler.C  : Macro used by hms_scaler.cfg

onlineGUI/Config/shms_scaler.cfg  : configuration file to plot SHMS scalers
onlineGUI/Macros/plot_shms_scaler.C  : Macro used by shms_scaler.cfg