impl: optimize guided filter, gradients, add omp support, add current
plan
impl: optimize some stuff(add omp), refactor nb stereo
save temp impl
impl: optimize, refactor bilinear interpolation
impl: stereoWBCVF(not done)
impl: implement and test stereoWBCVF
refact: rename PointTracker to PTAM
refact: rename Reconstruct to DTAM
doc: update task list
impl: dtam (not complite at all)
impl: DTAM (not complite)
impl: DTAM (complite but not tested properly and need improvement)