Bug 20969: Use modal to add and edit notes from basket

Bug 20969: Use modal to add and edit notes from basket

This patch modifies the acquisitions basket page so that links to add or
edit vendor or internal notes trigger a modal with the notes edit form
instead of redirecting to a different page. This is a markup change only
-- The form still submits to modordernotes.pl.

To test, apply the patch and view a basket in acquisitions which has
multiple orders. Test various note controls:  Add internal note, Add
vendor note, Edit internal note, edit vendor note.

Confirm that the operations work correctly with multiple orders in the
basket.

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Charles Farmer <charles.farmer@inLibro.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>