Remove unused maxspeed types for Austria

[wolfbert]

at:urban30 and at:urban40 have been superseded by at:city_limit30 and at:city_limit40 (which will be checked in a separate plugin).

Part of #2503

[wolfbert]

Changed abbreviations for Austrian provinces to something meaningful. I haven't found any use of them in the code, so hopefully this doesn't have further consequences.

Sorry for not creating a separate pull request, I still have to get used to Github.

[frodrigo]

Changed abbreviations for Austrian provinces to something meaningful. I haven't found any use of them in the code, so hopefully this doesn't have further consequences.

If the abrev are not used in the code there is no impact (not sure about that). But changing the name has lot of impact. It should match the name of the OSM extract provider and update in the Osmose frontend.

[wolfbert]

No problem, have reverted the changes.

[Famlam]

If the abrev are not used in the code there is no impact (not sure about that).

Sorry, didn't have the time to review, but when I checked what was newly committed I remembered one consequence #2510