Remove .cache, currently unused due to offlineimap
Remove curlrc
Remove GTK 3 settings
mutt: Make cache dir before loading

I really hope there's some better way to do this than set my_dummy...
mutt pgp: Remove Debian detection
mutt: Remove auto_tag
mutt: Confirm when appending message
mutt: Remove thorough_search, on by default
mutt: Tidy feel config
mutt: Remove PGP-Key header

This can be accessed from any keyserver
mutt: Remove use_domain, already on by default
mutt: Remove imap config

I don't use IMAP through Mutt any more.