GitLab

Introducing IvusTcSliceExtractor processor using Predicate Histogram Widget for classification setup.
So far just a draft - it is working but the results are not really beautiful.

Updated sigslot::concurrent_pointer_list implementation as well as added several typename declarations to calm down GCC.

Removed unlockInExtraThread flag from AbstractProcessor::process() - this is no longer needed as signal handling is done asynchroneously now anyway.

#ref 384

Conflicts:
	core/pipeline/abstractprocessor.cpp

Conflicts:
	core/pipeline/abstractprocessor.cpp
	core/pipeline/abstractprocessor.h

Added implementation for IEEE SciVis 14 submission on "Predicate-based Focus-and-Context Visualization for 3D Ultrasound" (Schulte zu Berge et al.) to advancedusvis module:
* Introducing AbstractPointPredicate base for point predicates and various derived classes
* Introducing PointPredicateHistogram, its corresponding PointPredicateHistogramProperty and the PointPredicateHistogramPropertyWidget
* Introducing PointPredicateEvaluator, PointPredicateRaycaster, PointPredicateVolumeExplorer and ScanlineDistributionComputation processors
* Added demo/reference pipeline implementations for the four data sets from the paper: Achilles tendon, shoulder and two carotid arteries