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The texture has the same size as the original us-image

warnings were caused by incorrect signature of updateProperties method

* Added GlImageResampler processor to lower the resolution of the US image
* Exposed solver parameters to the GUI
* Added AdvancedUSVisualization processor to display the data

This visualization overlays a solid color to the image, with the opacity
determined by the uncertainty.

* Fixed out-of bounds warnings, when showing 2D-Textures in Inspector
* Fixed bug introduced in 719004e0 which would crash the application when the
  PipelineTreeWidget had no item selected (e.g. when adding a new Pipeline)

Code still needs to be cleaned up a lot, and settings need to be exposed
to the GUI.

Now it is possible to change the property window just by navigating
the PipelineTreeWidget with the arrow keys

in the property window.
As this causes the property widget to move each time the user clicks on a
processor.

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.