RS: new attributes and sub element for <doors>

Jernbanedirektoratet needs for a better capacity planning to map the following attributes and sub element of the vehicle doors. Thus we suggest the following new attributes under : @openingTime - Time from stand-still of the vehicle to the flow of passengers can start through the doors. This is estimated to be at a door gap of 80cm. @closingTime - Time after closing signal is given on the last door to the vehicles can be put in motion. @minimumStopTimeDoors - minimum time between vehicle stops and starts the motion with doors opening and closing.

Thus we suggest the following new sub element under with attributes: @FlowSpeed - average/planned number of passengers per second that can flow through the doors and vestibules of the vehicle at given platform heights @platformHeight - platform height in millimetres for a given flow speed.