Fixed redirect after login

Now includes full paths for redirects, and avoids depending on `l()`,
which we've been moving away from for a long time.

Conflicts:
	pootle/apps/pootle_misc/baseurl.py
	pootle/templates/profiles/settings/evernote_account.html
pootle_app: Move VCS-specific code in pootle_app.vcs

This simplifies the migration towards Core
Cleanup: removed dead code