support for turn-restrictions

With the new TurnRestrictedMultiTargetDijkstraRouter
(http://apps.sourceforge.net/mediawiki/travelingsales/index.php?title=Plugin/TurnRestrictedMultiTargetDijkstraRouter)

we now can process turn-restrictions.
After house-numbers only signposting
remains as the last of the advanced features
being added to OpenStreetMap that we
now support.

It will be included in the 0.9.8 -release that is
due in a few days.