Starting from beginning of 2020 Python 2.7 is no longer supported[1],
hence the change of shebang for uc1541 script and removal of _ord
function.
[1] https://devguide.python.org/versions/
In modern linux distributions, executable "python" is a symlink to the
selected Python interpreter. There could be multiple versions installed
on the system, and appropriate tools on certain distributions exists for
selecting default one. There is no need for changing it to explicitly
"python3" executable.
