mail: Syncmail checks for existence of dependencies before use

In its default pre- and post-hooks, `neomutt-syncmail` now checks if
`imapfilter` and `notmuch` exist before invoking them.

Similarly, it defaults to `pass open` opening a pass coffin if
`pass-coffin` exists.

office/.local/bin/mail-searchcontacts

@@ -1,34 +0,0 @@
-#!/usr/bin/env sh
-# gets known e-mail adresses out of the current notmuch database
-#
-# called like `mail-searchcontacts [myadress]`
-#
-# where myaddress can be anything that connects mails to their adresses:
-# if directly found in the 'from': field, it will return those adresses
-# if no results are returned, it will switch to a more fuzzy search mode
-# looking through subjects, mail text, and so on for the keywords
-#
-# this can be somewhat slow for large mailboxes, in which case you probably
-# want to turn off fuzzy matching
-
-searchterm="$1"
-
-# make search fuzzy if 'fuzzy' is the second arg
-searchcmd() {
-  if [ -n "$1" ] && [ "$2" = "fuzzy" ]; then
-    term="and $1"
-  elif [ -n "$1" ]; then
-    term="and from:$1"
-  else
-    term=""
-  fi
-  notmuch address --deduplicate=address --output=count not from:marty.oehme@gmail.com "$term" | sort --numeric-sort -r | cut -f2- | sed -e 's/\(^.*\)\(<.*$\)/\2\t\1/'
-}
-
-results=$(searchcmd "$searchterm")
-
-if [ -z "$results" ]; then
-  results=$(searchcmd "$searchterm" "fuzzy")
-fi
-
-echo "$results"