throw out "zoomed" tapes. These drew 60% of the scale with bullets rather

throw out "zoomed" tapes. These drew 60% of the scale with bullets rather
than tick marks, and looser (zoomed) than the other 40%. Rationale:

- this was only used in *one* tape of *one* HUD ("custom")
- it's not in the MIL-STD!
- doesn't seem very useful
- relies on integer scale values, while we now have float values in the new HUD

This feature would have had to be rewritten anyway. If someone needs it and
can come forward with a (MIL-)STD description, then it can be added to the
existing tape generator again (using a value->screen-position mapper function).
Otherwise it's simply declared dead.

(Yay, one TODO and a few FIXMEs less.  ;-)