It's now possible to specify the configuration file to use on the
command line using the `notmuch --config=FILE` option.
+Top level option to redirect writes to stderr
+
+ With `notmuch --stderr=FILE` all writes to stderr are redirected to
+ the specified file. If FILE is '-', stderr is redirected to stdout.
+
Deprecated commands "part" and "search-tags" are removed.
Bash command-line completion