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Clear RecentModel current index:
- during a call when the call is OVER
- in chat view when clicking on back button

This allow to reselect the previous row, and visually reset
the row (remove highlight state)

Change-Id: I36f531c6304ce48f0be3cc541f28a21d73a05262
Tuleap: #202

Allow user to drag-select multiple messages

Change-Id: I1fcf115822dab791d3df35b29696be3af3800204
Tuleap: #202

- ability to chat off call
- system notification on incoming msg
- notification in smartlist

Tuleap: #202
Change-Id: Ide10f80f677f23022ad4296a82ae122e69a892cc