Write the node count for a road in the NET1 section.

This is used for house numbers and perhaps other things. It is set
regardless of whether the road actually has house numbers.

Fix a bug where the wrong bit was set if the house number bit stream was longer
than 255 bytes. Likely a very rare occurrence with OSM data.

git-svn-id: http://svn.mkgmap.org.uk/mkgmap/trunk@2946 25d90789-57f7-4ee0-8453-03a3dfeeeb22