refs #386

refs #386

Improved color mixing of predicate-based classification.

* Replaced two assertions in PointPredicateHistogramProperty with ifs and LERRORs.
* Minor adjustments in IvusTcDemo.

Fixed PointPredicateHistogramProperty::addSharedProperty() sharing the properties the wrong way around.

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.

Implemented reading of whole directory structure and post-processing of tissue classification into a single multi-channel image into IvusTcDemo pipeline.

* Introducing IvusBatchReader processor to read an IVUS volume from a batch of 2D images
* Introducing IvusTcDemo pipeline stub

* Tied tgt::OpenGLJobProcessor and tgt::OpenGLGarbageCollector closer together regarding OpenGL garbage collection
* AutoEvaluationPipeline checks for valid OpenGL state after each processor call (only in debug)

* Fixed AutoEvaluationPipeline missing some updates
* Fixed AutoEvaluationPipeline::executePipeline() to execute processors too often
* Fixed ParticleFlowRenderer overwriting bound FBO
* Added Debug checks to tgt::FramebufferObject and tgt::Shader to print warnings when FBO/Shader activation would overwrite an already active FBO/Shader

* Renamed OpenGLJobProcessor::iKnowWhatImDoingGetArbitraryContext() to OpenGLJobProcessor::getContext()
* Adjusted headers and method calls in various files

Moved AbstractJob and OpenGLJobProcessor from campvis-core to tgt and adapted and cleaned up all necessary includes/references.

* Fixed AdvOptimizedRaycaster::updateProperties overload.

Merged Morteza's changes into one single commit.

Added directories of various needed resources (textures, sampledata) to the CampvisShaderDirectories CMake variable, which is used for deployment. Replaced various occurences of CAMPVIS_SOURCE_DIR with ShdrMgr.completePath().

* Fixed GenericPointerData::getData() implementation
* Improved input data handling in RenderTargetCompositor: Will also show something if only one of the two inputs are set
* removed obsolete GlReductionTest pipeline

* Added optional picking information to GeometryData API
* GeometryRenderer processor renders the picking information into a separate texture if present
* geometrydata.h contains a stub for a possible rewrite of the API (more flexible buffer layout)

Updated VectorFieldDemo pipeline to allow the user to choose between arrow- and particle visualization.

* Introducing ParticleFlowRenderer processor implementing a particle simulation using OpenGL transform feedback
* Added tgt::Shader::selectSubroutine()
* Added tgt::VertexArrayObject::getId()

* Updated CMake scripts to work with new CMake 3 and TBB 4.3

Cleaned up DevilImageReader to be working with all kinds of input images and being completely OpenGL free.

* Updated DevilImageWriter, added property to make writing depth images optional.

Fixed GenericImageReader referencing DevilImageReader even if the corresponding module was not present.

* AbstractImageReader is now again an AbstractProcessor, so that we can get rid of the dynamic_casts in GenericImageReader
* DevilImageReader is no longer a VisualizationProcessor but gets the OpenGL context through OpenGLJobProcessor::ScopedSynchronousGlJobExecution
* Fixed alglib's CMakeLists.txt

[merged commit]clean ups, fixes for g++ errors and warnings, and edits for cppcheck errors (except for the 480+ in the external library AlgLib)