correction: relations may be missing when split-file is given
that contains overlapping tiles. The error was introduced with r316.


git-svn-id: http://svn.mkgmap.org.uk/splitter/trunk@326 838fabe5-b1a8-4b81-9896-7a84386980e9
update table of 50 most of used tag keys 

This helps to reduce CPU cycles needed in o5m writer.


git-svn-id: http://svn.mkgmap.org.uk/splitter/trunk@327 838fabe5-b1a8-4b81-9896-7a84386980e9