[gnome-db] GObject Introspection annotation improvements patch

[Daniel Espinosa <esodan gmail com>]

This patch adds lots of missing annotations. Most of them for nullable parameters, very useful on bindings.

Just note that:

At
 gda_thread_wrapper_execute, we need to verifify if @arg could allow 
null in some cases. If so needs (allow-none) annotation. I found that 
@arg_destroy_func could be null in some cases.

At gda_data_model_set_values, @values if by error is NULL we have a 
line: values = values->next; will rise a segmentation fault? (C 
programing un-knowlage, sorry=-). In bindings for now, it can't be NULL,
 is it correct?

At gda_data_model_append_values, I've added a line allowing @values 
to be NULL and implementors must set values to its default one. Is it 
correct? Is it a API break?

-- 
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"de grano en grano, se hace la arena" (R) (en trámite, pero para los cuates: LIBRE)

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