Additions to repository

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Hello,
This is to let you know that I submitted several changes to the brat
repository.  The concern the geometry db stuff.
1. BrRotMatrix.cxx, .h
    a).  Added GetInverse() which (obviously) returns the inverse
matrix.
    b).  Added istream functions so that one can use cout<<mat in cint.
    c).  Multiplication operator which makes constructing composite
rotation matrices much easier

2. BrGeometryDbManger.cxx
   a) Changes to use new features of BrRotMatrix which make the code
much more readable.

3. BrDbDetectorVolume.cxx, .h
    a). Change the real numbers from float(12,4) to double(16,8)  This
minimizes roundoff error when calculating composite rotation matrices.

4. BrDetectorVolume.cxx, .h
   a) Re-implemented istream features so that one can use cout<<vol.
That makes it much easier for debugging in cint.

Happy computing.

Kris

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