allow bike and pedestrian access for barrier=gate, set speed to 0

git-svn-id: http://svn.mkgmap.org.uk/mkgmap/trunk@2907 25d90789-57f7-4ee0-8453-03a3dfeeeb22
Merge three tests from the mergeroads branch that got lost in the main merge

git-svn-id: http://svn.mkgmap.org.uk/mkgmap/trunk@2908 25d90789-57f7-4ee0-8453-03a3dfeeeb22