don't set use_stun_server as True by default. It's useless when there is no stun server configured. Fixes #6935

mercurial python module is not installed in site-packages under windows. use hg binary instead to get current revision

Also use sed to remove now unneeded Vim lines, 2to3 -f ws_comma to fix
some whitespace, and fix some other madness manually.

also use 2to3 -f ws_comma to fix some whitespace

holy diff batman!

That way we can search through all logs in constant time instead of having to perform a full table scan.

Those variables were confusing because autoconf usually defines DATADIR to
PREFIX/share and gajim uses both defs.datadir=PREFIX/share/gajim and
gajim.DATA_DIR=PREFIX/share/gajim/data.

Now, autoconf will use PKGDATADIR for setting the (renamed) defs.basedir
variable which will be used to set gajimpaths['DATA_DIR'] and
gajimpaths['ICONS_DIR'] in configpaths.py

Gajim will also looks for the ${GAJIM_BASEDIR} environment variable instead of
${datadir} which was really too generic (no namespace).

Thanks Asterix for the initial version of this patch!

show only once unread messages at startup when we have twice the same contact in 2 accounts. Fixes #2921