moved useful methods to TangraTestCase class and subclassed all other test classes from that one
basic data saving tests are working. Need to add tests for all basic functions. Will do corner cases and bad inputs later
Working on saving data per stage. Have to deal with the ambiguity between sessions, stages, and stages with multiple iterations.
have most of the fixes for a moderately simplified stage numbering system in place.
Saving data in the most basic case is working now
Need to move the old studies over to the new way of saving and retrieving data after this overhaul.
Finished testing the most basic save/get data methods. Time to do fancier stuff with multiple stages