Merge pull request #84 from donnaaboise/master

Fixes to plotclaw<N>, queryframe and sliceloop

Works for me.
Fixed colorbars, which have not been appearing in 2d plots...
New attributes colobar_label, colorbar_ticks, etc. were added but omitted from 2d_pcolor plot_type, for example.  Added them more generally.
Also modified frametools.py to check if attribute add_colorbar exists rather than throwing an exception that was being ignored.
Merge pull request #85 from rjleveque/fix_colorbar

Fixed colorbars, which have not been appearing in 2d plots...
Added command which only illuminates the isosurfaces, and leaves the slices alone
Changes to 'help' comments
Fixed help on setcontourlineprops
Fixed help message for setting contourline properties