Glom table event

[Alaney Dória <27978 alunos isel ipl pt>]

From what I've being studding glom code, we could provide an interface 
for table events like:

OnNewRecord / OnFieldUpdate / OnFillDatabase .

Those events can be introduced in Box_Data_Details and Box_Data_List 
methods. Thought I still need to understand how is supported the running 
custom python script, so some hint would be very appreciated. For each 
table we would have the flowing on xml:

<events>
<event name="event_name" onevent="event">python script</event>
</events>

I would like to navigate more through this, so I would like to know the 
best way to tackle this in terms of programming. My first Idea is to 
make callbacks available on methods such 
Box_Data_Details::on_flowtable_field_edited, 
Box_Data_Details::fill_from_database. this is also a first step for 
supporting notifications in future.

So I would like to discuss this.
Regards