notification of when an ecard is picked up not available in d7

In the Drupal 6 version of this module, there was functionality to allow the sender choose whether or not they wanted to be notified when their ecard was collected. In the D7 version of the module, there was some code there but not working and commented out.

The attached patch adds in this functionality. You'll need to run the new update hook first before testing.

Note, I rolled this patch off the same codebase that has #1802320: pick_up time not being updated in the database, #1802066: Ecard field settings not working and #1380428: Incorrect verb tense and non-translatable text in user interface applied, so sorry if it doesn't apply cleanly. I just don't have the time to roll back those patches, and it kinda relies on the #1802320: pick_up time not being updated in the database patch anyway.