just defining constants

Adds the Post Processing Specs card "Volumetric Integration Output Format" with options "Verbose" and "CSV" which indicate respectively the original output format or a more convenient (for analysis with python anyways) CSV output format. It must be used with the "Post Processing Volumetric Integration" card. However if not used Goma, will default to "Verbose" original style.

Untested, however it compiles. Now I need to try it with one of my old level set problems.

Also it doesn't make sure the "Post Processing Volumetric Integration" card is used. It might work anyways.

Tested. Found no card defaults to verbose behavior, 'Verbose' yields verbose behavior, and 'CSV' yields labeled comma seperated value output behavior

fixed minor things

Tested default, Tested parallel, Added Warning.
Merge pull request #5 from acochrane/vol_csv

"Volume Integration Output Format" card