Samuel Douglas

Rollback to fix greek betacode bug #1260 temporarily fixing some changes in the beta_to_unicode.py module. Also updating to 1.3.1.

I have had problems running the beta_to_unicode.py module in the current version when I upgraded from version 1.2.1. Tested on Python 3.9 on mac and 3,11 on debian linux (virtualenvironment)...