Refactored R scripts and cleaner call to script from CABIN_RCA.py
Remove 'group' selection and allow selection of different diversity measures
Remove verbose print statements
Allow user to update the plot with different diversity without re-running RCA
Several updates (see below)

Added Berger-Parker diversity measurement (D).
Simplified and merged RCA output into single object and single output file.
Started creating a save dialog box for output.