Improve comparison functions

[blongworth]

Comparing results currently works by comparing the 1st analyst's results from the database to the second analyst's results in the database. A more flexible system would be to allow the user what to compare. Options should be: current analysis in memory, 1st analysis in DB, 2nd analysis in DB, with a separate option to select blank corrected or un-corrected data. Should default to current analysis vs other analyst's work (ie, compare to 2nd if we are 1st, 1st if we are second.