* Fixed signal issues in VolumeRenderer when updating the raycasting processor.
* Fixed assertions in AutoEvaluationPipeline::onPropertyCollectionPropertyAdded() and AutoEvaluationPipeline::onPropertyCollectionPropertyRemoved().

Conflicts:
	modules/vis/processors/volumerenderer.cpp
	modules/vis/processors/volumerenderer.h

Added AutoEvaluationPipeline also monitoring PropertyCollection's s_propertyAdded and s_propertyRemoved signals.

Conflicts:
	modules/vis/processors/volumerenderer.cpp
	modules/vis/processors/volumerenderer.h

Issue543: changing raycaster in volumeexplorer: added raycasterfactory, something is going wrong while replacing

Conflicts:
	modules/vis/processors/drrraycaster.h
	modules/vis/processors/simpleraycaster.h

Conflicts:
	modules/vis/processors/volumerenderer.cpp
	modules/vis/processors/volumerenderer.h

* Added TextureReaderTga::loadTextureArray().
* Added OrientationOverlay to VolumeRenderer.

Procfactory

See merge request !110

Conflicts:
	application/gui/mainwindow.cpp

Neuro project cleaned

See merge request !109

Introducing ViscontestDemo pipeline showing an example rendering of multi-volume ray casting and combined fiber rendering.

* Fixed FiberReader parsing TrackVis files with additional scalars
* Fixed off-by-one error in StringUtils::split()
* Fixed VoxelHierarchyMapper support for non quadratic base sizes.

* MultiIndexedGeometry supports instanced rendering
* FontAtlas supports writing picking information

* Fixed wrong picking in ViewportSplitter
* Let QuadRenderer have two quads to render, one with [-1, 1] coordinates, one with [0, 1] coordinates
* Fixed the recent fix in StringUtils (commit: fe48b9778e)
* Added stringsafe support in TextFileParser
* fixed cgt::minElem
* fixed Doxygen in fontrendering::FontAtlas

Introducing DTI module with FiberReader, FiberTracker and FiberRenderer processors (code base copied over from columbia module branch, generalized and fit into the DTI module).

Adapted CsvdImageReader and MhdImageReader to the new API.

Further work on neuro project, making use of ViewportSplitter, fixing MultiVolumeMprRenderer shader.

Introducing ViewportSplitter class to campvis-core, a nice proxy class to support splitting the viewport into multiple views.

When rapidly switching between processors in the tree view, the
PropertyCollectionWidgets would sometimes cause the program to crash. This
happened because some signals originated from a different Thread and
sometimes caused a user-after-free error on the widget objects.

Introducing MultiVolumeMprRenderer processor, rendering a slice through up to 3 co-registered images at the same time. Updated NeuroDemo pipeline and implemented picking of MPR plane.

* Fixed MSVC warning in mainwindow.cpp

* Included VoxelHierarchyMapper for empty space skipping
* Now can successfully render three volumes at the same time.