updated geometry

[Beni Zihlmann <zihlmann@jlab.org>]

Dear colleagues,
I updated the geometry in the repository. The geometry now reflects
all the changes and design decisions that have been made lately.
1) remove outer most CDC layer thereby reducing the CDC radius by 1.6 cm
    including the cable runs.
2) re-route the FDC cables to run upstream
3) add an 8mm aluminum plate on the inside of the BCAL
4) the BCAL readout segmentation is 4x6 (sector x layer)

all these changes are now available the in geometry file hddsGeant3.F 
located in
src/programs/Simulation/HDGeant/

cheers,
Beni