Remove recomendation to use non-free software

Based on an almost three years old helper here: http://listas.trisquel.info/pipermail/trisquel-devel/2012-June/000684.html

Closes https://trisquel.info/en/issues/1942

See merge request !99

Disable remote content search in unity

This closes https://trisquel.info/fr/issues/13019

See merge request !98

Add make-xchat helper

This helper uses [this patch](https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=691477#28) to replace the reference to a nonfree browser (Opera) with a reference to the default system browser (x-www-browser). It should work on toutatis too.

See merge request !100

Original helper from Ryan Houlgate

Closes #1942

Firefox v38 issues 2

Fix branding for firefox v38

See merge request !96

Fix elementary icon theme

See merge request !95

Fix apt-p2p problems with import

This closes https://trisquel.info/en/issues/12444

See merge request !92

Import qelectrotech from source upstream

See merge request !91

Closes #12444

darkice: import from multiverse

This closes https://trisquel.info/en/issues/6535

See merge request !89

mplayer-skins: import from multiverse

This package is needed by mplayer-gui

Closes https://trisquel.info/en/issues/2341

See merge request !87

musescore included a non-free example

Original helper by Kouta Ikematsu

This closes https://trisquel.info/en/issues/10838

See merge request !88

Add ddccontrol package from debian jessie

This closes https://trisquel.info/en/issues/5358

See merge request !86

dsniff: fix segfault in urlsnarf

As suggested here https://trisquel.info/en/issues/5689 , this drops 23_urlsnarf_timestamp.patch

See merge request !84