r472: * Fixed issues with extended parameters to dh_gencontrol including spaces

r472:    * Fixed issues with extended parameters to dh_gencontrol including spaces
     and quotes. This was some histirical cruft that deals with splitting up
     the string specified by -u, and it should not have applied to the set
     of options after --. Now that it's fixed, any and all programs that
     support a -- and options after it, do not require any special quoting
     of the succeeding options. Quote just like you would in whatever
     program those options go to. So, for example,
     dh_gencontrol -Vblah:Depends='foo, bar (>= 1.2)' will work just as you
     would hope. This fix does NOT apply to -u; don't use -u if you must do
     something complex. Closes: #89311
   * Made escape_shell output a lot better.