changes for paraview export now feature

Merged David E. DeMarle requested to merge demarle/cinema_python:for/paraview into for/paraview

add a way to skip the automatic time stepping that the old paraview gui interface used so that we can call it like catalyst does, one step at a time.

make cinema keep track of all of the files and keys written so that paraview's export to D table can unroll the A-C information into a flat table

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