This patch set allows a user to specify a list of tags to be
added/removed to messages discovered during "notmuch new".
Two use-cases are envisaged:
1) A chunk of messages was just dumped into the configured
directory by hand, and the user doesn't want the 'inbox' tag
applied to them. Run 'notmuch new -inbox'.
2) A periodic mail processing script wants to add new messages to
the database, then process those newly added messages to add
convenience tags, etc. without worrying about the user or other
instances of the script manipulating tags at the same time. Use
this approach:
KEY=$RANDOM
notmuch new +$KEY
notmuch tag +notmuch tag:$KEY and to:notmuch at notmuchmail.org
notmuch tag +gnus tag:$KEY and to:ding at gnus.org
...
notmuch tag -$KEY tag:$KEY
