First steps towards rbZoom
-Solves the lost of control of focus over containers
-Improves rbzoom activation
-keyevent from qvtkwidget are sent to medMainWindow enabling the
activation of shortcut via keypressevent and keypressrelease
Small changes
-Now after choosing zoom as the main mouse interaction the focus is
directly brought back to the view.
- A new shortcut has been defined for the histogram
- This commit desactivates most of the key shortcuts that were existing in
  the code of vtkInria.
Removes useless lines
Resolves the rbzoom bug appearing when the ctrl key is pressed when the application loses focus
I added a new class vtkInriaInteractorStyleRubberBandZoom which inherits
from vtkInteractorStyleRubberBandZoom, this class will enable us to
reimplement some function to our advantages. Now the ctrl + right click
activates the rubber band zoom in all modes.
Gets rid of a lot of warning messages - Removes all the commented lines
activating useless shortcuts - Reactivates the 'r' and 'n' shortcuts.
This commit:
- changes the shortcut for histogram feature to ctrl + H
- removes the shortcut for the angle widget
- synchronize the zoom between view when the reset shortcut is used or the
  rubberBand Zoom
Hack to not have eventFilters everywhere
Fixed Ctrl+Space
Remove eventFilters
Restore Qt::ClickFocus on vtkWidget
Fixed the focus issue with view containers
Somewhat more efficient way of updating the container selection ring
Force Ctrl for Ctrl-space on mac
Now a view will not lose focus if a click is made outside the container
Remove some commented code
Merge pull request #80 from Hakim-F/rbZoom

Rubber band zoom + slice change via keyboard
Merge pull request #127 from gpasquie/QSSCorrection

Restablish medDropSite background color