put changes back in
Displays a warning when forcing CDAT_BUILD_MODE

If CDAT_BUILD_ESGF is enabled, then CDAT_BUILD_MODE gets forced to
"LEAN". This commit displays a warning when that happens.
fix #601 - update python to latest 2p7p8
completely messed it up
got it do use much less renderers but it shoved no time at all from plotting

draw colorbar with 224 colors actually takes .5 seconds! Need to improve that code
ok got the VTK 2D plots to return a dict of reusable things
Adding vtkGrid arg to VTK plot backend
slightyl faster naimations....
removed print statement
Merge remote-tracking branch 'origin/master' into optimize_vtk
ok most test suite runs now
one set of test fails no idea why continents are not drawn on that test
put conts z back to their regular value
correct print stement syntax
Update python_external.cmake

commenting out patch step
Merge pull request #1 from doutriaux1/patch-1

LGTM - Update python_external.cmake
Add Camera to saved state
fixed merge conflicts
removed print statements
Add OSMesa (CDAT_BUILD_OFFSCREEN to enable).