This shouldn't be needed anymore as it was a temporary fix for LP:1127866

This shouldn't be needed anymore as it was a temporary fix for LP:1127866

    when the 3d clipping is performed

replaced glLoadIdentity(); glMultMatrix... with glLoadMatrix, there's no
need to multiply the 2nd matrix with the identity before the loading

perform vector operations (additions/multiplications etc) otherwise 
the transformations won't be correct. If we include the w value in the 
addition etc we might have unexpected projections (when w > 1) and 
divisions by 0 (when w = 0) because opengl divides the x,y,z values by w.

Move a updateXToGLSyncs() call to the correct place due to a bad merge.

Use the GL_EXT_x11_sync_object OpenGL extension to synchronize updates with X11 to avoid unrefreshed parts of the screen on Nvidia hardware.

This seem to cause also a crash when using software rendering.

OpenGl: Run the opacity filter after all other filters have been run. Fixes https://bugs.launchpad.net/compiz/+bug/1257223.

methods don't have virtual destructors, added the virtual destructors to
get rid of warnings and potential memory leaks

once they are no longer current to any thread.  To ensure
the context really is destroyed, lose current from it
before destroying it.

1. Completely remove decorOffsetMove and other related code from
   decor.cpp. Put the logic to handle the window->input () - window->border ()
   placement offset inside of setWindowFrameExtents instead. Now the window
   will always be offset from its original non-decorated position to the new
   decorated position, rather than having to guess between decoration sizes.
2. Make saveGeometry and restoreGeometry work relative to window->border ()
   as opposed to including it in the saved geometry. It is possible that the
   border size might change during maximization, as such, we don't want to
   save the position with the border before maximizing. Instead save the position
   as if it were never decorated so that when the window is restored it can be
   restored to its original position and then adjusted for its new border size.
3. Fix a few typoes in the tests.
4. Moved some commonly used matchers into compiz::testing
5. Make COMPIZ_PLUGIN_DIR accept multiple directories and look in each one
   of them for the plugin
6. Set COMPIZ_PLUGIN_DIR appropriately for each plugin that we wish to load
   on startup so that we load locally built plugins as opposed to installed
   ones.
7. Uncomment compiz_discover_tests for the acceptance tests. Now they are
   run by default.

textures changed.

This fixes a crash with new MESA drivers and high monitor resolutions
caused by the fact that we're accidentally using some MSAA configs with
some drivers in Mesa 9.0.
Taking in account the values of GLX_SAMPLES and GLX_SAMPLE_BUFFERS
fixes the issue.

See mesa bug https://bugs.freedesktop.org/show_bug.cgi?id=61182