1.0.24.30: fixed and tested some more cleanups on hppa-hpux

1.0.24.30: fixed and tested some more cleanups on hppa-hpux

 * Fix a stray #+ -> #!+.

 * Removed unneeded nops.

 * Explanation of magic numbers (but not yet substituted.)

   (Above changes in patch by Larry Valkama)

 * Fix a bunch of comments in the HPPA backend to use the right number
   of semicolons, and use FIXME-lav instead of FIX-lav to mark things
   (better grepping for the rest of us.)