Make it possible to request parking POIs and similar with gisgraphy (and potentially others too)

[karussell]

to search by name, the URL is something like http://services.gisgraphy.com/fulltext/?q=sebastopol&style=long&placetype=parking

or name / GPS : http://services.gisgraphy.com/fulltext/?q=sebastopol&style=long&placetype=parking&lat=48.8566101&lng=2.3514992

fulltext webservice is possible but the placetype parameter is not mapped in the converter

or by GPS position : http://services.gisgraphy.com/geoloc/search?format=json&lat=48.856610100000005&lng=2.3514992&placetype=Parking

geoloc webservice is not available yet in the converter.

so it need some developpement