[issue] mailbox is not saved upon signal recv (esp. SIGHUP)

[Tomas Telensky <tomas@xxxxxxxxx>]

Hi mutt developers!

I've been suffering this issue for too long and finally decided to report
it. It's actually annoying to loose mailbox changes every time my ssh
connection is closed.

I actually think mutt shall allow to save the mailbox upon signal exiting,
especially for SIGHUP. There could be a configuration option for it.

Or, there could be a setting which function which could be called upon
exiting, and the user could set "sync-mailbox" fuction for it. (Don't know
whether mutt allows to group functions together into custom functions, in
that case it would be useful).

Also see http://www.webservertalk.com/message859356.html

        Tomas