Bug 29393: Ability to send emails from patron details page

Bug 29393: Ability to send emails from patron details page

Test plan
  - apply Bug 12802
  - go to a patron's details page
  - click on "Add message" in tools bar
  - choose "Email" in "Add a message for"
  - Select a notice (module members) or manualy fill the message
  - Save
  - Check the message is saved in message_queue table

Signed-off-by: Matthias Le Gac <matthias.le-gac@inlibro.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>