Add TPIC, TFLIP, and correct an error in the affine augmentation

This MR adds both TPIC and TFLIP motion integration strategies. It also corrects an error in the affine augmentation: the matrix D and B were not reset to 0 before incrementing their coefficient at each iteration.

I will merge it right away, since it has been a while that I'm am using TPIC and TFLIP through the temporary branch tmp_tpic_bspline, where I cherry-picked the modifications brought by both this branch and the bspline branch.