Updated CSparse interface, #554
Swapped isTriu <-> isTril, #554
Updated qr(.,.) (removed old), #544
Updated qr(.,.) (added new), #544
Updated solve(Matrix,...), (removed old) #554
Updated solve(MX,...), (removed old), #554
Bugfix, cleanup for 77000468e8b03a7ca6c15a736bab80a3c042d7d4
Fixed forward/backward substitution in solve(Matrix,...), #554
Cleanup solve(Matrix,...), #554
Moved isTril/isTriu implementation to CRSSparsityInternal, #554