[RP] bug groups

[Joe Corneli]

Proposal:

  Function: gnext &optional POP

  If POP is non-zero, switch to the most recently visited window in
  the next group.  Otherwise, just make the next group current
  without selecting any of its windows.

Also, groups aren't saved when restarting.  I seem to recall that
the groups-windows-frames info can all be saved and restored; anyone
want to (re)post the howto / add it to to the wiki?

Thanks,
Joe