Export function get_family_data

[fernandohds564]

I don't think it is a good idea to export the family_data dictionary. Instead, it would be better to export the function get_family_data, because sometimes we change the number of elements of the accelerator, for example when we insert ids in the model, which will break the information in the dictionary, created when the module is imported.

What do you think, @afonsoharuo , @xresende , @LuanaVilela ?

[xresende]

Agreed.