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Improve WUT performance by testing magnitude before visibility.

Eric Dejouhanet requested to merge edejouhanet/kstars:improve__whatsuptonight_performance into master

This MR improves the behaviour described in #63 for the What's Up Tonight dialog by testing the magnitude of enumerated objects before testing their visibility, which is largely more expensive.

As an illustration, this change reduces the time taken to enumerate asteroids in the What's Up Tonight dialog from ~130s to 15ms.

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