mapping: add 3D warping input (i.e. -z option).
modified:   CImg.mapping.cpp: add -z command line option for mapping at z position in 3D warping; change map size check; add 2D mapping at 3D z position in 3D warped volume.
modified:   Makefile: setup developpement version for mapping and format (i.e. v0.0.2 that is fully compatible with v0.0.1 but add 3D warp feature).
modified:   VERSION_MAPPING: version v0.0.3.dev .
modified:   VERSION_WARPING_FORMAT: version v0.0.1.dev .
modified:   _ToDo.txt: small changes.
modified:   _info.txt: add 3D warping example.
mapping: add 3D mapping in warped volume.
modified:   CImg.mapping.cpp: add z mapping in map container; add -zs for this purpose.
mapping: remove 3D mapping of 3D warping volume as it could be very large, using "on the fly interpolation" instead.
modified:   CImg.mapping.cpp: remove zscale option that corresponds to; remove 3D mapping of 3D warping volume; replaced by "on the fly interpolation" using map.linear_atXYZ(x,y,z0,?) (checked: not differences at z=0.0 and z=1.0, tiny ones at z0=0.2 ).
warp/mapping: setup 3D warping and 2D mapping in any parallel plane to calibration planes (v0.0.4)
modified:   CImg.mapping.cpp: clean code and todos.
modified:   CImg.warping.cpp: setup (X,Y,Z) calibration steps and save X,Y and Z grids; clean code and todos.
modified:   Makefile: upgrade versions to v0.0.4 for both warping and mapping, and for format that is still compatible with the previous one.
modified:   VERSION_MAPPING: v0.0.4 .
modified:   VERSION_WARPING: v0.0.4 .
modified:   VERSION_WARPING_FORMAT: v0.0.2 .
modified:   _ToDo.txt: update and add todos.
mapping: small changes.
modified:   CImg.mapping.cpp: clean todos.