for eigenvalue_decomposition or the triangular solver.

to benefit from LAPACK.

two OCA based svm optimizers.

svm_c_trainer to produce incorrect results in certain unusual cases.  Also added
unit tests to make sure the bug stays fixed.

for measuring the strength of an edge since this produces a slightly better
result.

evaluate incorrectly because the *= operator took the right hand side by reference
and thus experienced an aliasing problem.  The other op= operators had similar
problems and have also been fixed.