Update position of MUCH GEM and RPC modules for the Nickel run, refs #2520

much/much_v22k_mcbm.geo.info

+MUCH geometry created with create_MUCH_geometry_v22k_mcbm.C
+
+Build a mMUCH setup for mCBM with 2 GEM.
+10 mm thick Al plates are used for support and cooling in the GEM modules.
+Drift and read-out PCBs (copper coated G10 plates) inserted for realistic material budget for both GEM and RPC modules.
+
+No of Modules: 1      ( GEM )
+Position of Modules Z [cm]: 75.7    
+
+Placement of Modules:
+Module	X [cm]	Y [cm]	
+----------------------
+ 1	7.2	24.53
+----------------------
+
+Al Cooling Plate Thickness [cm]: 1    
+Active Volume Thickness [cm]: 0.3    
+
+
+ GEM Module:
+                7.5 cm
+               .........                 |
+              ...........                |
+             .............               |
+            ...............              |
+           .................             |
+          ...................            |
+         .....................           |
+        .......................         80 cm
+       .........................         |
+      ...........................        |
+     .............................       |
+    ...............................      |
+   .................................     |
+  ...................................    |
+ .....................................   |
+.......................................  |
+                40 cm
+