[mkgmap-dev] Commit: r1579: When adjusting turn headings, take account of through_route relations.

Version 1579 was commited by markb on 2010-02-18 20:39:57 +0000 (Thu, 18 Feb 2010) When adjusting turn headings, take account of through_route relations. This relation may be defined for a junction to indicate which ways are the "through route" when that cannot be inferred from the ways' names or refs.