Make GetMinValue const and inline in GateImage clas. Add sibling function for maximum value.
Add a new class: GateImageBox. It behaves like a G4Box for tracking but displays image with three orthogonal planes in OpenGL: axial, sagittal and coronal.
Only works in OpenGL Immediate mode ( /vis/open OGLI ). If OpenGL is not present nor activated, it displays itself like a simple box.
Update GateImageNestedParametrisedVolume to use GateImageBox instead of G4Box for mother volume.
This does not change tracking and physics results, only gives a better representation in OpenGL.
Merge remote-tracking branch 'opengate-creatis/geant4_10_00' into opengl-image
Add include std typeinfo.
Fix broken source tree when Geant4 9.5 was in use.

Compile without error now. Tested with G4 9.5.2, 9.6.0 and 10.0.0 with Qt and no visualization:
- Geant4  9.5
	* Always displays a simple box
- Geant4  9.6
	* Displays a simple box in Stored mode,
	* Displays a simple Solid box in Immediate mode,
	* Displays three orthogonals planes in wireframes and Immediate mode.
- Geant4 10.0
	* Displays a simple box in Stored mode,
	* Displays a simple Solid box in Immediate mode,
	* Displays three orthogonals planes in wireframes and Immediate mode.
Update GateImageRegionalizedVolume to use GateImageBox instead of G4Box for mother volume.
Add a grey border to the three planes.
Check that OpenGL headers are still available instead of just making an assumption.
Merge branch 'develop' into opengl-image

Conflicts:
	source/digits_hits/src/GateTrajectoryNavigator.cc
	source/geometry/src/GateAngularRepeater.cc
	source/geometry/src/GateImageNestedParametrisedVolume.cc
Update GateImageRegularParametrisedVolume to use GateImageBox instead of G4Box for mother volume.
Merge remote-tracking branch 'origin/opengl-image' into develop

Conflicts:
	source/digits_hits/src/GateTrajectoryNavigator.cc
merge with opengl
Launch macro within Qt if it is given in argument and if Qt mode is asked.

Before:
$ Gate --qt
then /control/execute macro.mac
Now:
$ Gate --qt macro.mac