[gnome-db] Better instrospection support

[Daniel Espinosa <esodan gmail com>]

As for libgda, there are some structures witch are hard to introspect, making libgda out to be fully useful on other languages supporting GObject Introspection.

Using, as a guide,

https://wiki.gnome.org/Projects/GObjectIntrospection/WritingBindingableAPIs

and taking the opportunity to libgda 6.0, to break API in order to be more introspectable friendly, will be great to improve.

I've filed bug #754725, to track down and discus required API changes.

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