MATSim Code

- allowed transport modes should now be properly handled when importing and exporting networks
- when exporting networks via the save (or save as) action, the filechooser and export path are set to the associated file
- the default selected export coord system is now set to system which is used by the current network(layer)
- when closing josm, the user is no longer recommended to upload his data. however the possibility to upload a network layer is not yet fully removed