Initial port of GeneralMatrix, for all cases not covered by Matrix1,2,3,4.
The 'inverse()' method will uses JAMA. We do not expose JAMA directly because inspection of
the inverse algorithm suggests that JAMA uses a less square algorithm for non-square matrix,
while the referencing module will need a different approach (to be committed later).


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK7@1521923 13f79535-47bb-0310-9956-ffa450edef68