check for platform and it's stop_position

[osm-ToniE]

for each platform (member of the relation), check whether there is a stop_position as member. If not:

• check whether there is a stop-position with the same name as a node of a member-highway
• check the distance of that stop-position
• check whether there are two stop_positions with same name close to platform
• if within reasonable distance (20 m?), push error, that the closest stop-position should be included into relation

Those platforms and stop_positions which do exist have to be included into relation.