Add SOS analysis to example script

Adds the SOS spectrometer and the SOS chambers, hodoscope and shower counter to the hodtest.C example analysis script.  Not all h* parameters have equivalents for the SOS in the ENGINE parameter files.  Those without SOS equivalents are made optional in the DBRequest list and given sensible defaults.

Analysis of run 50017 runs without crashing and some SOS data appears in the tree.  But otherwise, things are totally untested for the SOS.