remove superfluous dot(...) with scalar-valued quantities
Merge pull request #335 from firedrakeproject/test_steady_adv_fixes

remove superfluous dot(...) with scalar-valued quantities
remove exterior_facet_topbottom code (expanded at the UFL level)
Merge pull request #329 from firedrakeproject/remove_topbottom

remove exterior_facet_topbottom code (expanded at the UFL level)
paraview output -- check for OPC, not OPE