Improve Geographical support

[Guite]

At the moment the generator creates two coordinate fields (latitude, longitude) for entities with geographical enabled as well as some geolocation functionality on creation.

Furthermore it would be nice to:

• display maps from different providers (google, msn, yahoo, openstreetmap, ...) (mapstraction is available as system plugin in Zikula 1.3.1)
• provide a reusable component to let users pick coordinates from a map during editing
• KML export

[Guite]

As Google Maps is not free anymore openstreetmap should become the primary service which is also better due to it's openness and freedom.

[gfr]

Mapstraction needs googlemaps to show openstreetmap so i will use googlemaps in the templates