[mkgmap-dev] Commit: r3491: Revert to using multisortkey to sort street names.

Version mkgmap-r3491 was committed by steve on Fri, 06 Mar 2015 Revert to using multisortkey to sort street names. The 'saving memory' fix lead to incorrect sorting. There would be other ways to slightly reduce the peak memory usage, but they will need some more thought.