Issue 290: Player not restartable after redundant next() causes _source_read_index to fall below zero (fixed).
Issue 290: Player not restartable after redundant next() causes
_source_read_index to fall below zero (fixed).

mpasternak/michaldtz-fix-552,Alwnikrotikz/pyglet,xshotD/pyglet,shaileshgoogler/pyglet,google-code-export/pyglet,mpasternak/pyglet-fix-issue-518-522,qbektrix/pyglet,gdkar/pyglet,arifgursel/pyglet,mpasternak/pyglet-fix-issue-552,cledio66/pyglet,Alwnikrotikz/pyglet,gdkar/pyglet,google-code-export/pyglet,arifgursel/pyglet,mpasternak/michaldtz-fixes-518-522,mpasternak/michaldtz-fix-552,qbektrix/pyglet,odyaka341/pyglet,shaileshgoogler/pyglet,Alwnikrotikz/pyglet,google-code-export/pyglet,cledio66/pyglet,cledio66/pyglet,mpasternak/michaldtz-fixes-518-522,gdkar/pyglet,odyaka341/pyglet,shaileshgoogler/pyglet,qbektrix/pyglet,mpasternak/pyglet-fix-issue-552,mpasternak/michaldtz-fixes-518-522,Austin503/pyglet,arifgursel/pyglet,qbektrix/pyglet,mpasternak/michaldtz-fix-552,arifgursel/pyglet,gdkar/pyglet,kmonsoor/pyglet,Austin503/pyglet,Alwnikrotikz/pyglet,xshotD/pyglet,cledio66/pyglet,google-code-export/pyglet,mpasternak/michaldtz-fix-552,shaileshgoogler/pyglet,odyaka341/pyglet,mpasternak/pyglet-fix-issue-518-522,google-code-export/pyglet,kmonsoor/pyglet,Alwnikrotikz/pyglet,odyaka341/pyglet,shaileshgoogler/pyglet,xshotD/pyglet,qbektrix/pyglet,Austin503/pyglet,mpasternak/pyglet-fix-issue-552,xshotD/pyglet,arifgursel/pyglet,Austin503/pyglet,mpasternak/michaldtz-fixes-518-522,mpasternak/pyglet-fix-issue-518-522,kmonsoor/pyglet,mpasternak/pyglet-fix-issue-518-522,odyaka341/pyglet,gdkar/pyglet,cledio66/pyglet,kmonsoor/pyglet,Austin503/pyglet,kmonsoor/pyglet,xshotD/pyglet,mpasternak/pyglet-fix-issue-552