More simplification attempts:

1) Removed MatrixSIS.isIdentity(double tolerance) and setToIdentity() because a search in Geotk code base has
   shown that those methods were rarely used, and when used they could be replaced by more efficient code path.
   In particular, the 'setToIdentity()' method name was problematic because it was inappropriate for non-square
   matrices. Removing this method avoid us the need to invent a new name.

2) Renamed (again) 'setToTranspose()' to a plain 'transpose()' because we had no other remaining 'setTo*' methods
   in MatrixSIS, and we presume that developers who want the transpose operation will look for the "transpose" name.
   There is a slight risk of misleading name since this method performs the operation in-place, but the fact that
   the return type is 'void' should help to avoid errors.

3) In test cases, initialize the random number generator and the matrix size in the class constructor instead than
   in an 'initialize' method. This avoid the need to put defensive code against multiple initializations.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK7@1522604 13f79535-47bb-0310-9956-ffa450edef68