setup magnification along X axis using top points (WiP).
modified:   CImg.warping.cpp: output on cout magnification along X axis using the 2 top points (L,Lr,M,Mr).
move both call (upper) and code (in a function) for magnification.
modified:   CImg.warping.cpp: ouput on cout magnification for both X and Y axes for both left/right and top/bottom limits.
warping: upgrade version as output were added: sizes and grids.
modified:   CImg.warping.cpp: add 3 file name options for outputing size (average mapping image size and pixel size) and both X and Y grids.
modified:   Makefile: upgrade version to v0.0.3 .
modified:   VERSION_WARPING: version v0.0.3 .
warp/mapping: image_size from warping to mapping done.
modified:   CImg.mapping.cpp: add usage examples; add option from image_size from warping loading and load file in case of setting; add information for saving file time.
modified:   CImg.warping.cpp: add usage examples; add basename for output files (-ob); add information for saving file time.
modified:   Makefile: upgrade mapping version to v0.0.3 .
modified:   VERSION_MAPPING: version v0.0.3 .
clean and document.
modified:   _info.txt: get cimg version command line (by hand).
modified:   distortion: CImg.mapping.cpp: clean.
modified:   distortion: _info.txt: setup new -ob option example and NetCDF conversion example too.