Resolve "Re-scale the dRICH" -- long snout option

This branch is to allow us to quickly switch between the option of having a long (20cm) snout, and not.

Note: base branch is that of #10 (closed), not main

compact/definitions.xml

@@ -395,7 +395,7 @@ Examples:
 
     <comment> Global PID regions with suballocations for TOF and RICH detectors </comment>
     <constant name="ForwardPIDRegion_zmin"        value="CentralTrackingRegionP_zmax" />
-    <constant name="ForwardPIDRegion_length"      value="104.0*cm" />
+    <constant name="ForwardPIDRegion_length"      value="120.0*cm" />
 
     <comment> Forward TOF region currenlty empty for future upgrades </comment>
     <constant name="ForwardTOFRegion_zmin"        value="ForwardPIDRegion_zmin" />