(error during error handling)

This reverts commit b46f0f5e.

Conflicts:
	src/tabs/muclisttab.py

Doing this made the unresized elements refresh in the old subwins,
causing glitches and weirdness. And anyway, the only problematic
element is the TextWin (rebuilding all the lines of a buffer is
expensive), but it already checks if the width changed.

happens when beep_on contains "message".

thanks eijebong

- when list-multi doesn't have selected values at all
- text-multi.options() provided by sleekxmpp is apparently a '\n' separated
  string, and not a list

(also, wrap one forgotten call to curses funcs)

- change_title plugin

(keep a get_name() fallback just in case for now)

- Guess-parse the OTR messages in search for xhtml upon arrival
- add a configurable option to decode it or not
- We have XHTML-IM for a reason, and therefore we will *not* implement a
  full html parser for clients that dump whatever formatting inside the
  OTR payload (looking at you, pidgin)

- also, fix the /xhtml command that was nesting one <body/> too many

(also, fix a traceback-typo)

some stuff is now hidden wen the window size gets too small (might need
some adjustments). The info buffer in the roster tab, the userlist in
mucs, the vertical tab list, the info buffer everywhere, etc…

Sadly, we can’t doctest stuff with backslashes because it drives doctest
crazy.