Support Atmos command line

This patch makes cc65-built Atmos files look like BASIC programs (with machine language) instead of pure ML programs.  And, the tape files don't have the autostart flag turned on.  That means:

1. We finally are allowed to type command-line arguments for Atmos programs.
2. We don't need to remember an address number, in order to start an Atmos program; we just type "RUN".
As far as I see it's onyl a question of style to use `__BASHEAD_LAST__` here instead of `$050E`. In that case I ask you to stick to `$050E` as this is the style used in the other cfg's. See for example c64.cfg.