Added a new tool: calc2DFFfromChrPoints for producing a flow field from chrPoints text files.

M    CMakeLists.txt
A    src/tools/calc2DFFfromChrPoints.cpp

Added units to the displayed information.
M    src/tools/imageinfo.cpp

New param in the crop whether to zero offset of the output image or not.
M    src/tools/crop.cpp

A bug in printing out the line profile was corrected.
M    src/tools/getline_profile.cpp