modify shebang check for python2.x to accept `python2`
python is linked to python3 by default; this work required packages unable to run under python3 to be modified to run under a new symlink ...
python2 is symlinked against 2.7, or the latest 2.x on the machine.
This, and similar issues regarding py3k, prompted PEP 394:
and after discussion was well received by BDFL/debian maintainers/et al. ... sooo the regex should be updated to make the
.X part optional when checking the shebang because syntax highlighting fails for