Moved part of the code of the 2D merge to have smaller methods.
Added comments about the merge methods
Fixed errors on simple_merge method. 2D Quads are no longer shown.
Added metho to find white pixel at bottom-left of image.
Improved simple_2D_merge to use iterators and less arguments. Also
much more efficient.
Delete unused variable on simple2dmerge
Fixed follow_path_2D_merge method. Added control to toogle all simple
projection skeleton on/off.
Added method to specify initial row and colum of get_bottom_white
Small optimization of the follow_path method
Added/removed comments