[#5837] one-line import changes to remove pylons.c|g
[#5837] fix more complex imports of pylons.c|g
[#5837] remove pylons backwards compat code
[#5837] remove ForgeHg from run_tests
[#5837] update tricky bits referencing pylons.c|g
[#5837] update other tool versions for their pylons.c|g updates
[#5837] better test isolation