Metaform UI updates

Options to apply a metaform to multiple documents at once.

1. Metaform can now be added to all documents in a collection from the
collections edit menu (not to children collections).
2. Metaform can be added to all documents from the import menu.
3. Direct sub-collections now listed on a collections main page.

Signed-off-by: shanesuofi <shanes@vandals.uidaho.edu>