Review Request: Bug 942 - Tracking of GL Buffer Objects for multithreaded context sharing

Bug 942 <https://jogamp.org/bugzilla/show_bug.cgi?id=942>

Interesting part starts w/ Comment 5
  <https://jogamp.org/bugzilla/show_bug.cgi?id=942#c5>

Major change commited here:
  <http://jogamp.org/git/?p=jogl.git;a=commit;h=09fc7aa5539731bb0fba835caee61f6eb837ecff>

follow-up commits are adaptations, tests and refinements.

Thank you!

Kind regards, Sven