some fleshing out of post processing api
exchange family test now looks in post process for pref_flow
read_uuid now returns, oops
removed read_uuid
test combine now cleans up after itself only if it passes
create is now only called if file is not read-only
added post processing driver to tools
test family exchange now cleans up properly after itself
outlined implementation for postprocessing work
added pp interface to problems
more pp structure, close to being there
split parser generation into its own function
test main only uses argparse now, no more subprocess
adding a cycloptsrc file for testing
pp table name update
full post process stack complete, test with primitives in test_main.py and visual inspection to confirm
tables now can still append data if the table is none
moved writeable check to flush with data
version bump for adding pp CLI, closes #21