Add additional options to Mutt output

Incorporating an extension by Fernando Schapachnik which adds options
to Mutt output for using addressees' nick names instead or additional
to Mutt aliases.



DIGEST: Users who use kabcclient to access KDE's address book from Mutt
can now get a contact's nick name (if it exists) instead of or
additional to the usual alias key.

E.g. if there is a contact John "Jonny" Doe
the instead of

JohDoe John Doe

one can now get either (new option 'prefernick')

Jonny John Doe

or (new option 'alsonick')

JohDoe John Doe
followed by
Jonny John Doe