[gnome-db] Transformation functions from G_TYPE_STRING to G_TYPE_any

["Daniel Espinosa" <esodan gmail com>]

I'm working on add functions to GLib to transform a STRING to GLib's
types; now only exists a way to transform to a STRING but not from a
STRING; to do so I need to find the value_transform_int_string function
(and the others in gvaluetransform.c file) in order to write the
functions to transform from STRING some types.

GDA, has some code to transform them, but may is better to have them in
GLib; unless you consider that is better that library must register his
own custom transformation functions.

I had filed a bug in:

http://bugzilla.gnome.org/show_bug.cgi?id=342358

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