Write a "notmuch tag" command to add/remove tags from messages
matching a search query.
+Rename notmuch_thread_results_t and notmuch_message_results_t to
+notmuch_threads_t and notmuch_messages_t respectively.
+
+Add a talloc context as the first argument to each command in
+notmuch.c.
+
Write a "notmuch show" that displays a single thread.
Fix to use the *last* Message-ID header if multiple such headers are
encountered, (I noticed this is one thing that kept me from seeing the
same message-ID values as sup).
+Audit everything for dealing with out-of-memory (and drop xutil.c).
+
+Write a test suite.
+
+Achieve 100% test coverage with the test suite.
+
Think about this race condition:
A client executes "notmuch search"