remove some warnings given from xcode tests...
Merge pull request #659 from kerautret/Viewer3dWarning

remove some warnings given from xcode tests...
missing extension in .ih
Merge pull request #661 from kerautret/ReaderImprove

missing extension in .ih Reader/Writer
small export change in pgmWriter in 3d
missing extension in .ih
Merge pull request #662 from kerautret/PGMWriterTinyEdits

Pgm writer tiny edits
add the include dir for qglviewer use in DGtalTools (find some pb when installing qglviewer in user directory from git repo)
Merge pull request #668 from kerautret/cmakeEdits

Small improvement for DGtalTools and qglviewer use
add example image and small update
other edit
cleaning duplicated doc in Statistics.ih
add an assert and moving test file in the good directory
forget CMakeLists changes
Merge pull request #670 from kerautret/StatisticEdit

add an assert and moving test file in the good directory
Merge pull request #669 from kerautret/SmallCleanExample

add example image and small update
save
Merge branch 'master' into Fix_IntegralInvariant
save