Intercept HDiv and HCurl, fix two extrusion tests
rearrangement of extrusion tests; some new tests
minor reordering of file
add Galerkin projection test for OPEs
rewritten scalar helmholtz convergence test (extruded mesh)
removed outdated tests
minor: fix up extruded Helmholtz test description
moved LSW 'test' to demos directory (was never really a test)
Rewrite tests to use parametrize
minor: removed obsolete line