Add color to the info messages
Unlock the tab when the locked resource goes offline

…………………………

(why wasn’t that already here?)

config.get('option', 'value').lower() == 'value' is just ugly and
stupid, especially for bool.

One if in basetabs:556 was also missing a comparison, leading to True
whenever the option was set.

Allow opening a static conversation even when a (dynamic) conversation with the contact is already open

- No idea why subclasses of ConversationTab were working before
    (info_header was overriden with None in __init__)
- Or why the date parsing worked (“Exeception”)
- Some more reformatting with pylint indications
- Document each module in the tabs module

(but since it is not important, use distutils when setuptools is
unavailable)

also remove old stuff from the default config

(no idea why this is appearing now)

- todo: write a common import file to avoid duplicating the imports

- add a get_tabs(cls) method to avoid manual filtering
- move some stuff to avoid cyclic dependency hell between tab classes

sort the configurations options by theme
make the sidebar fixed

When the connection lags and the user presses tab,
poezio will insert a tab inside the input, wich has now
a specific formatting. This caused poezio to crash.

ssl page (img & ref)
theming (compile errors, format and typos)