[FIX] mail: prevent race condition in discuss

The discuss application starting process is strongly asynchronous.
However, it relies implicitely on the fact that the widget is not
destroyed in its starting process.  For example, if the widget is
detroyed before the updateChannel method is called, then any call to the
chat manager service will return undefined and the widget will crash.

When discuss is destroyed exactly between the start and the end of the
creation of its search view (which is asynchronous), then it is possible
to have a crash, because the search view will be destroyed when the
do_search method is called.

Note that we had to fix discuss mobile as well:
The _setChannel method is supposed to return a deferred, but the mobile
override did not return it.  As a result, a test in the mobile suite
failed because this.alive takes a deferred in argument.

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