Big commit for the Paint segmentation plugin:
- Now the paint brush can be changed via the ctrl + wheel
- Remove erase button
- Fix bugs with button gui
- New usage of magic wand. Now you set a seed and play with the sliders to
  obtain the desired result.
Removes useless commentary

Conflicts:
	src-plugins/medSegmentation/msegAlgorithmPaintToolbox.cpp
Small changes on the magic wand sliders
Improves information about the seed in the paintPlugin
Uggly commit for preventing windowing on masks