Added tests for the legacy class system. * double.m, eq.m, ge.m, gt.m, horzcat.m, ldivide.m, le.m, lt.m, minus.m, mldivide.m, mpower.m, mrdivide.m, mtimes.m, ne.m, plus.m, power.m, rdivide.m, times.m, uminus.m, uplus.m, vertcat.m: New overloaded class methods. * test_classes.m: Add tests. Rewrite some tests to ensure they run in Matlab without modification.