Modifications in the geometry to accommodate PLT and BCM1F
Added diamond to list of materials.
More modifications to include luminometers
Definition of the volume for luminometers PLT and BCM1F
Geometry of BCM1F
Geometry of PLT
Merge pull request #2646 from robervalwalsh/my-710pre3-bril-geometry

 Geometry -- 710pre3 tracker-lumi geometry