mapping: setup developpment version for any plane mapping (in progress).
modified:   CImg.mapping.cpp: add z_map for any plane mapping using depth map.
modified:   Makefile: setup developpment version for mapping and v0.0.7 for warping.
modified:   VERSION_MAPPING: version v0.0.5.dev .
modified:   VERSION_WARPING: version v0.0.7 .
mapping: setup plane equation (WiP).
modified:   CImg.mapping.cpp: setup plane equation and functions for 3 point plane.
mapping: mapping on any plane (WiP).
modified:   CImg.mapping.cpp: make it compile; setup z map in comment.
modified:   Makefile: temporary: remove warping from compilation.
add todos for gathering code in functions.
modified:   CImg.mapping.cpp: add todos as comments.
mapping: gather code in functions.
modified:   CImg.mapping.cpp: setup functions to gather mapping code.
modified:   Makefile: upgrade version to v0.0.6 .
modified:   VERSION_MAPPING: version v0.0.6 .
mapping: move functions to header file.
modified:   CImg.mapping.cpp: move main functions to header file.
new file:   mapping.h: move main functions to header file.
mapping: add initialisation of mapping single function.
modified:   CImg.mapping.cpp: call the init_mapping function.
modified:   mapping.h: add init_mapping single function.