Fixed typo in tests/test_basis_transformation.py on line 84. Fixes issue #106
Merge pull request #107 from helgrind/Bugfix#106

Fixed typo in tests/test_basis_transformation.py on line 84.
ADDED: Use RCM by default in SS solvers

Direct SS methods that use sparse LU decomposition make use of RCM by
default.
ADDED: RCM tests

Added two additional tests for RCM reordering