[GSoC] model validation - update

[Honza Král]

Hi all,
I didn't get much work done as I was waiting for feedback for
questions I posted in last week's status. I didn't get many replies
(big thanks to all that sent theirs) and it appears that the common
use case would justify going for the most powerfull interface:

def validator(value, all_values={}, model_instance=None): ...

I will start actual work the week after the next one, I will start
with porting the unique validation and writing more tests (possibly
migrating some tests from doctest to unittests).

Honza Král
E-Mail: Honza...@gmail.com
Phone: +420 606 678585