avoid use of writable global variables in V4L capturing module (thanks to fjmadrid for the patch! - see the ticket #384)

a crash with the libv4l capture code

Forgot to update so code after previous fix

This was crashing my code:
    for( size_t i = 1; i < imagePoints.size(); i++ )
        objectPoints.push_back(objectPoints[0]);

Changed by:
objectPoints.resize(imagePoints.size(),objectPoints[0]);

Plus clean up on Qt code

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Qt: Now OpenGL rendering is ok

fixed "undefined cvCreateCameraCapture_V4L" linker errors on some linux distros (thanks to miguelinux for the patch)

Qt compilation pb with OpenGL flags fixed

temporarily disable 16-bit input in cap_dc1394_v2.cpp (ticket #296). thanks to sebastians for the patch!

Fixed bug with exclusive buttons
Fixed memory leaks

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  - cvCreateOpenGLCallback: draw 3D on top of the image

bool not defined ? -> changed everything in int

 - add CV_RADIOBOX with exclusive mode

 - cvAddButton changed to match requirement
 - CV_GUI_NORMAL and CV_GUI_EXPANDED done
 - context menu with right click