Animator/GLWindow: Catch 'ThreadDeath/Throwable' and dump info in DEBUG mode (cosmetic change only); Typo in comment; TestSharedContextListNEWT2: Stop animator.
X11GLXDrawableFactory.Shutdown: Disable shared context destruction since it may lead to a JVM freeze ..

.. on ATI fglrx driver 32bit on 64bit w/ a frozen shared GL context involved.

Hence we have to rely on the driver cleanup when JVM hits 'exit',
equal to the Windows implementation.