Wrap wget with torsocks, instead of configuring it to use Polipo (Closes: #6623).

This is yet another step on the road towards removing Polipo.
Add a design doc section about how we torify wget.
Merge branch 'feature/7416-gnupg-socks' into feature/5379-remove-polipo
Merge branch 'feature/6623-wget-socks' into feature/5379-remove-polipo
Merge branch 'feature/8194-APT-socks' into feature/5379-remove-polipo

Conflicts:
	wiki/src/contribute/design.mdwn
Remove all traces of Polipo: we don't use it anymore (Closes: #5379, #6115).
Install torsocks (2.x) from wheezy-backports (Closes: #8220).
Merge branch 'devel' into feature/6880-torsocks-2
Use torsocks for whois, instead of torify.
Use torsocks for Gobby, instead of torify.
Wrap Totem to torify it with torsocks.

Also, AppArmor: allow Totem to read torsocks.conf. Technically speaking, it's
not really required, as the compiled-in defaults are the same as whatever is in
the stock torsocks.conf. But still, this avoids nasty error messages in the logs
and when running Totem from a terminal.
Merge remote-tracking branch 'origin/feature/6880-torsocks-2' into devel

fix-committed: #5379 Remove Polipo or replace it with Privoxy

Conflicts:
	config/binary_rootfs/squashfs.sort