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 mentioned in other scenarios I have a pretty strong dislike for commented out code without clear explanation of the reason of the commenting-out. Of course here one can sort of guess that the commented-out line is meant as alternative to the line above. But what about going instead for one of these alternatives:
- Create  another cfg file maybe called atmos-graphics.cfg (or atmos-tgi.cfg ?) being only different in this line.
- Create a weak variable with the value `0` that gets multiplied by `$1C00` and then added to `$9800`. Then the user can override it with `1` on the cmdline.