Stable release 1.12.2

A bunch of fixes and some features restored:
- fix guile loading path
- respect message-cite-reply-position
- bring back mu4e-message-goto-(top|bottom)
- bring back mu4e-compose-context-switch
- bring back mu4e-compose-attach-captured-message
- improve manpages layout
- flag messages with "list-unsubscribe" as MailingList messages
- fix some build warnings
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