There was an issue regarding c1541 in old version - during removal of
the file from the image, as a success message 'ERRORCODE 1' was placed
on the stdout. If there was an issue with the file different message was
placed also on stdout. Luckily, that weird behaviour was fixed in 3.x
series of the Vice. So now we can remove unnecessary code.
Also, fixed two bugs for pyton3, introduced during new formats
development.
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.
