This makes the tag set a bit less trivial.
Note that if you use the small corpus, this is not so interesting (and
is also a bit noisy) since the messages will not be found. In the
future this could be checked for.
Conflicts:
performance-test/01-dump-restore
+time_run 'load nmbug tags' 'notmuch restore --accumulate < corpus.tags/nmbug.sup-dump'
time_run 'dump *' 'notmuch dump > tags.out'
time_run 'restore *' 'notmuch restore < tags.out'
time_run 'dump *' 'notmuch dump > tags.out'
time_run 'restore *' 'notmuch restore < tags.out'