Merge remote-tracking branch 'origin/testing' into testing

Conflicts:
	config/chroot_local-includes/etc/iceweasel/pref/000-tor-browser.js
Merge branch 'bugfix/7285-yelp-crashes-on-anchor' into experimental
Revert "Open local documentation with Yelp." (Closes: #7390, #7285)

This reverts commit 200bf88af7c1db51b2e6551d4aa0391cc8781530.

Yelp in Wheezy has quite some issues in our usecase, and the browser
issue that made us move to Yelp has vanished.
Bypass our custom iceweasel wrapper when opening offline documentation pages.

It may be that one wants to read the documentation because one fails to connect
to the Tor network. Being told "Tor is not ready", and asked "Start Tor Browser
anyway?" will likely confuse users in such a case.
Merge branch 'bugfix/7285-browse-doc-with-iceweasel' into experimental