Updates for TVector(D).h, TMatrix(D).h
and test/vmatrix.cxx

As you can see, filling of a matrix can be done with an array prepared
by row-wise or column-wise storage.
GetElements() will supply you a pointer to the COLUMN_WISE stored
matrix data.
GetElements(Double_t *array,Option_t *opt) will let you store it in a user
supplied/allocated array either column- or row- wise.


git-svn-id: http://root.cern.ch/svn/root/trunk@4444 27541ba8-7e3a-0410-8455-c3a389f83636