Adding test for div2d, div1d+weights. div2d+weights not working
Adding the div_3d test without weight
adding div (3d) test with weights
commiting the new div
way to better grad
adding the new grad
fixing the merging conflict
correcting a copy-paste error
grad are now adapted
New prox, divs and the tests that goes with.
TODO: Fix crazy prox calculations
PEP8
small optimization
merge fix_all into demo_dr
demo nearly finished