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fix maxGuidestarsHFR issue, fix test, increase max dither size

Hy Murveit requested to merge murveit/kstars:guider-fix21 into master

Fixed a few small internal guider issues.

  • testguidestars was failing due to a param. Corrected that.
  • A user complained that the max dither was too low for wide-angle lenses. Upped the max-dither value from 10 to 30 pixels.
  • I've seen a couple instances recently where the maxHFR parameter in guiderstars is set wrong, e.g. set poorly for the plate-scale used by the camera/telescope, or wrong because of focus or sky conditions. In any case, that parameter was just supposed to be a (obscure) hint that helped choose the best guide star. Unfortunately, in these cases it was causing all star detections to be ignored and thus causing the guider to fail when there were apparently plenty of stars. Now we detect these situations and, if necessary, relax the maxHFR constraint.

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