Add toll field to the link output for osm2gmns

[ssmith55]

Tolls are important in some locations, and can affect routing. A "toll" field (integer, in cents, on the link table) is already part of the GMNS spec. Coming from OSM, there appears to a a yes/no toll tag on ways. As a starting point, one might have toll = 1 when the OSM toll is "yes", 0 otherwise. Then the user can adjust it to be the correct toll.

Example from New Hampshire:

Thank you.

[jiawlu]

thanks for your comments. we will add that feature in the next osm2gmns release. we will keep the issue open while we are working on that.