[Mutt] #3073: next-flagged function, for selecting next message which is flagged

[Mutt <fleas@xxxxxxxx>]

#3073: next-flagged function, for selecting next message which is flagged

 It would be fine to have function "next-flagged" which allows to select
 next message in current dir which is flagged. This is particularly
 important feature for peoples (like me :-) which heavily use flagging.
 Working patch for hg tip (changeset: 5417:5ab92dd44ce2) is attached (but
 it's something like POC implementation)

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Ticket URL: <http://dev.mutt.org/trac/ticket/3073>