Quicker exit and re-enter of large groups

[Kai Grossjohann <grossjohann@charly.informatik.uni-dortmund.de>]

Hi,

I sometimes find that I've got large groups where summary buffer
generation takes quite some time.  WIBNI something like the following
was done?

- New function for quitting a newsgroup which does (switch-to-buffer
  "*Group*"), mostly.  ==> Old summary buffer is retained, reenter of
  group is fast.  Add a keybinding for this.  This is simple.  Does it
  already exist?  I think "Q" does something different?

- When I hit M-g in a group and there are new articles is it possible
  to just add them to the summary buffer without regenerating all of
  it?

kai
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