must manually "Clear keyframe sequence" when doing multiple runs with OpenSpace-keyframe-concat-interp.html

[hn-88]

If OpenSpace has not been restarted after a previous run, keyframe sequences may not have been cleared though the html interface does not show any keyframes.

We actually want the html page to show any keyframe sequences in OpenSpace, so this is some bug in OpenSpace-keyframe-concat-interp.html

Need to check if in fact Claude's suggestion of Bug 3 is actually valid.