[dev] [en] Bug fix for wix and couple of improvements

[Adrien]

Hi to you!

Here a few patches for sat and libervia again.

Goffi> could you please check them in - after checking :-)

There are some modifications for PEP8 compliances which make it 
difficult to read... I hope it's still OK... let me know if something is 
wrong with that.

Below a copy of the commit messages for sat:

plugin XEP-0085: improvement for sendind "composing" state
**************
wix, plugin XEP-0085: bug fix at startup when the method 
chatStateReceived doesn't exist
TODO: implementation for displaying the states on the chat window and 
sending "composing" states
**************

For libervia:

browser_side: check for duplicate name before adding a new contact group
**************
browser_side: set the focus to the first field when a tab is selected 
from the register panel
**************
browser_side, plugin XEP-0085: limit the number of bridge methods calls 
for "chatStateComposing".
**************
browser_side: center the buttons of GenericConfirmDialog
**************
browser_side: display widget title in the debug info (LiberviaWidget 
method "getDebugName")
- better PEP8 compliance
**************
browser_side, misc: better PEP8 compliance
**************
browser_side: added the flag REUSE_EXISTING_LIBERVIA_WIDGETS
- do not create a new chat panel for contacts/groups if a similar one is 
found
- this goes with a modification of the class methods to create new 
panels (for genericity)
- improvement of the accepted groups list for MicroblogPanel (remove 
duplicates and keep sorted)

Details for the new flag:

# Set to true to not create a new LiberviaWidget when a similar one
# already exist (i.e. a chat panel with the same target). Instead
# the existing widget will be eventually removed from its parent
# and added to new WidgetsPanel, or replaced to the expected
# position if the previous and the new parent are the same.


I will hopfully finish this week a prototype for a rich text editor. Not 
wysiwyg but for with some buttons to help the users decorating is text 
with some tags, also something to send messages to several 
contacts/groups (sending them in a batch first, then we will need to 
implement XEP-0033[1]).

[1] http://xmpp.org/extensions/xep-0033.html

Best regards,
Adrien
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