BUG #14198: Making it easier to add new annotations.

Users can now add/edit annotations easily. Simply add the first row using the
"+" button and double click to start editing the text. Now by hitting Tab key,
one can edit the next item in the table. By hitting Tab key past the last item,
one can add new rows to the list as well.

Change-Id: I33be54400c9af3e1bdb62bcc3d23042da532c5bc
Merge topic '14198_easy_add_annotations' into next

49ac4e1 BUG #14198: Making it easier to add new annotations.