[FIX] mail: redirection handling in chat windows

- clicking on a channel mention (or a user) from a chat window opens a new chat
  window for that channel
- clicking on any other link in a chat window correctly opens the corresponding
  document

2 minor changes were required:
- use do_show() instead of on_reverse_breadcrumb() to update control panel and
  url in client action, as other actions can be stacked over the client action,
  e.g. by clicking on a document link in a chat window. In that case, the
  on_reverse_breadcrumb callback wouldn't be set, and thus the control panel and
  url wouldn't be updated by coming back to client action using the breadcrumbs.
- channel_join() now checks whether or not the channel has already been joined
  (i.e. if it is in the JS cache) before performing the RPC. This check was
  performed by each caller, so this simplifies the code.

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