correct check for wrong use of routable types: complain only
when used for level 0.

git-svn-id: http://svn.mkgmap.org.uk/mkgmap/trunk@3268 25d90789-57f7-4ee0-8453-03a3dfeeeb22
enlarge list of special routable types to  
0x01-0x13, 0x16 or 0x1b


git-svn-id: http://svn.mkgmap.org.uk/mkgmap/trunk@3269 25d90789-57f7-4ee0-8453-03a3dfeeeb22