[Cin] Some changes for testing purposes for clipping and speed

[Phyllis Smith]

An x86 AppImage for older Operating Systems AND with the alternative
shortcut set is at:
   https://cinelerra-gg.org/download/testing/cin-x86_alternative.AppImage
Hoping *IgorBeghetto* might get a chance to test this weekend.
Changes included are for
  - Blur plugin should prevent clipping  (Andrea has tested successfully)
  - Title plugin should prevent clipping (Andrea has tested successfully)
  - Because BT #672 (https://www.cinelerra-gg.org/bugtracker/view.php?id=672)
was fixed without real understanding of the underlying problem, testing of
Speed and especially Bump Autos (which is what I think that the original
blunder fix addressed) would be helpful.  Explanation of Bump Autos is
still online at:   https://cinelerra-gg.org/download/testing/bump_autos.pdf
Feedback welcome.  Thanks, Phyllis
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