Blender Git Loki

ocean sim
- UV's were not being calculated if there were too many VColor layers.
- precalc (omd->size * omd->spatial_size) was being called in a loop.
- use vector functions to avoid pointer indrections on each access which the compiler wont optimize - eg: och->ibufs_disp[f]->rect_float[4*(res_x*j + i) + 1]
- dont call abs() on ints (converts to double and back to int in this case).

also unrelated render buttons change. move saving options directly under the file path since these were easy to confuse with image format options like zbuf, ycc, preview.. etc.