Delete useless file
New Qt tutorial: color clouds
Adjust to new constructor for ConditionalRemoval
Merge pull request #1006 from rjcharron/devel

Adjust to new constructor for ConditionalRemoval
Make nan values detection case insensitive
Add introduce_nan program
Merge pull request #1005 from VictorLamoine/qt

Qt tutorials
Merge pull request #1004 from VictorLamoine/master

Make nan values detection case insensitive