Time SNES solve
Remove timing specialised mesh building functions
minor doc fixes
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
Merge pull request #334 from firedrakeproject/paraview_ext_fixes

paraview output -- check for OPC, not OPE
add CircleManifoldMesh (gdim 2, tdim 1)
add non-extruded circumference tests
add radial-extrusion-of-circle test
add poisson test