WIP: SplineImageView::operator() Thread-safety#188

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RegiTheSter wants to merge 2 commits intoukoethe:masterfrom RegiTheSter:master

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Commits on Jun 4, 2014

Added optional VIGRA_THREAD_SAFE macro which can be defined before including splineimageview.hxx to ensure thread safety in SplineImageView::operator()
RegiTheSter
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copy paste bug.
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