Small steps towards the undo redo feature for the paint segmentation
plugin with several images.

Conflicts:
	src-plugins/medSegmentation/msegAlgorithmPaintToolbox.cpp
	src-plugins/medSegmentation/msegAlgorithmPaintToolbox.h
Undo redo for paint segmentation works just fine now even with several
images
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.

Conflicts:
	src-plugins/medSegmentation/msegAlgorithmPaintToolbox.cpp
	src-plugins/medSegmentation/msegAlgorithmPaintToolbox.h
Removes useless commentary
Small changes on the magic wand sliders
Improves information about the seed in the paintPlugin
copy/paste slice

Conflicts:
	src-plugins/medSegmentation/msegAlgorithmPaintToolbox.h
Paint segmentation : this commit defines functions to copy and paste from and into the 3d Mask
Small improvements :
- Adds keyboard shortcuts for the magic wand
  - AcceptGrowth -> ctrl+Return
  - RemoveSeed -> ctrl+BackSpace
The shortcuts can only be activated when the magicwand is.
- Now, after interaction with the sliders/spinboxs/buttons of the
  toolbox the focus should go back to the view
- Now, when a seed is planted, a call on undo via ctrl+z will remove the
  seed.
New way of using the magic wand via ctrl + click
Improves update stroke function, better looking paint less random
adds vtkcircleCursor object
We currently use it via "ctrl" in v3dview for implementation/testing purpose but it should be used in the paint segmentation plugin.
This is an alpha version of the Feature.

Conflicts:
	src-plugins/libs/vtkInria/vtkImageView/CMakeLists.txt
	src-plugins/v3dView/v3dView.cpp
*New version of undo/redo feature
	- improves memory management
	- works with 3d magic wand
	- Removes undo/redo stacks when view closed
	- works with copy/paste slice feature
*vtkCircleCursor not activated with CTRL anymore (see commented line in
v3dView)
* Improvements for copy/paste slice feature
	- Corrects bug occuring when no view is opened

Conflicts:
	src-plugins/medSegmentation/msegAlgorithmPaintToolbox.h
	src-plugins/v3dView/v3dView.cpp
corrects mistake done during rebase

Conflicts:
	src-plugins/medSegmentation/msegAlgorithmPaintToolbox.cpp
wand timer added to improve the reactivity of the 3d mode - renamed Accept growth to new seed - improved the cursor visualization in term of performance and memory

Conflicts:
	src-plugins/medSegmentation/msegAlgorithmPaintToolbox.cpp
	src-plugins/medSegmentation/msegAlgorithmPaintToolbox.h
hide cursor reactivated for paint brush, beginning bezier curve stuff

Conflicts:
	src-plugins/v3dView/v3dView.cpp
	src-plugins/v3dView/v3dView.h
solves mac compilation problems
removes the bezier code in the paint plugin
this commit corrects the mistake made probably during the rebasing
[PAINTSEG] Improve behaviour when closing and reopening an image