So, I changed a lot of code to reduce boilerplate on models in the
future. Currently we do not have a lot of models, but this can increase
quite rapdly. There's a second TreeModel in the works, the Yearly
Statistics, this patch will save around 250 LOC for this new model,
and more and more models will give us a greater saving.
Iwll do that for the table models in the future too - I did the tree
models now because they are the most complex case and I didn't wanted
to create a second tree model without this.
Signed-off-by: Tomaz Canabrava <tcanabrava@kde.org>
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