Visu patches

tools to visualize tangential dans sectional view.
Typical use:
./visuPatches -v ../../SPR-1-T/1.2.840.113619.2.55.3.1670609623.803.1322469363.801.1.dcm -p ../../tmp.sdp -m ../../marrow.ofs  -x 0.65 -y 0.65 -z 1.25