add the cylindrical Guermond test to the suite
fix output functio names, *_1 -> *0 in full_cylindrical
pep8 adaptions
generalize some test functions
fix for error computation in p
move plotter to test helpers, use them in ns- and time-tests
avoid unneccessary vector copies for TentativeVelocityProblem
renamed u[0] to u[-1] for later consistency with multistep schemes
whitespace
simplified initial state generation
don't create functions in the stokes solver
properly rename u0, p0
avoid needlessly calling errornorm()
Merge branch 'master' of github.com:nschloe/pymelt