[Mutt] #3310: Overhaul new mail reporting

[Mutt <fleas@xxxxxxxx>]

#3310: Overhaul new mail reporting
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 Reporter:  brendan  |       Owner:  mutt-dev
     Type:  task     |      Status:  new     
 Priority:  major    |   Milestone:  1.6     
Component:  mutt     |     Version:          
 Keywords:           |  
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 Support notification for both new and old mail (configurable) for all
 mailbox types. See NewMailHandling.

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Ticket URL: <http://dev.mutt.org/trac/ticket/3310>
Mutt <http://www.mutt.org/>
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