Flip around inverted dual grid cells
Store cell masks in a map

This allows the different outputs to use their own flags for whether a
cell is useful or not rather than stomping on each other.
Remove custom VTK writing function

The Catalyst Python script now controls this.
*** DNM *** Use lib64 in some places
*** DNM *** Add all ParaView libraries needed
*** DNM *** Ignore pnetcdf completely