- bump to 1.3.20
    - fixed license tag
    - created general versioning scheme for version tag & tarball URI)
    - sed: /usr/local/bin/python -> /usr/bin/env python in Jython's cgi.py
    - convert .py$ files from mode 0644 to mode 0755
    - possibility to convert '\r\n' end-of-lines to *nix-like '\n' in all
        '.py$' files