Model: Cartography: Map: fix incorrect OpenDirections check
requested to merge 71-bug-buildings-in-some-rotations-don-t-connect-to-the-navgraph-if-the-pavement-at-the-entrance into master
Previously, the list of not yet rotated directions was used to determine which directions are open when processing the navigable cells.
Fixes #71 (closed).
Closes #71 (closed)