warping: adding automatic plane detection crosses if (Work in Progress).
modified:   CImg.warping.cpp: add if condition for next implementation of cross detection in other planes, presently setup hand selection in all.
modified:   Makefile: setup development version.
modified:   VERSION_WARPING: dev .
warping: add extraction of closest cross (WiP).
modified:   CImg.warping.cpp: add previous ROI size for search window.
warping: tl point auto-detected in next planes (WiP).
modified:   CImg.warping.cpp: draw this in color image.
warping: setup automatic plane detection crosses (after first hand selection on first plane for 3D warping only).
modified:   CImg.warping.cpp: setup loop for the 4 corner points for each other plane; remove temporary cropped image displays.
warping: upgrade version to v0.0.6 ..
modified:   CImg.warping.cpp: clean code.
modified:   Makefile: upgrade version of warping to v0.0.6 .
modified:   VERSION_WARPING: version v0.0.6 .
modified:   _ToDo.txt: set done.
modified:   _info.txt: change ls to echo as list is resorted by ls.
warping: clean code.
modified:   CImg.warping.cpp: add function for marker detection in an other plane (i.e. z>0) from previous plane (e.g. z==0 selected by hand).