fix corrections
add RasterPicture unit test
add RasterPicure3D test and load wrong file
Add TestRasterPicture
add virtual function for accesssing pixel value
add contractor on raster picture
move constant into the .h file
Change function operator()(uint, uint) --> operator()(int, int)
By convention  I(x,y) with x < 0 or y < 0 returns 0
This functionnality is used to compute the integral image
debug contractor on RasterPicture
update test on RasterPicture
RasterPicture: cosmetic changes + unformizing error handling
Add TestCtcRasterPicture file
remove tests on load function
enable RasterPicture's tests
add copy constructor and change init() to private
add comments on file ibex_RasterPicture.h