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Itk Segmentation and Registration: wrappers and demos

This branch makes use of the ItkReader and currently contains a SegmentationDemo and a RegistrationDemo that use Itk wrappers for segmentation and registration algorithms. It is meant to be a starting point for future Itk segmentation and registration algorithms that are to be wrapped. Commits have been cherry-picked from the mhaimagereader branch.

Set the default background color to black such that the volume visualization can ignore the background

Use ItkReader instead of GenericImageReader. Currently, this is more suitable for the SegmentationDemo and RegistrationDemo because of the supported image formats

inherit a VolumeExplorer instead of an AbstractProcessor - avoids duplications in the required implementation + get dot scribbler coordinates for the segmentation seed

registration demo - starter: so far, rigid registration for 3D with Mattes Mutual Information metric - Cristina Precup

Qt threading issues

Lua console

Finished a quick and dirty implementation of a Lua console in CampvisApplication.

* CMake build files now support unix builds
* SWIG interface files and Lua wrappers are now fully C++ compliant to comfort GCC
* Hacked shared/static builds of the campvis-modules module even more, but now it works on both MSVC and GCC

* AbstractData now stores a weak_ptr to its shared_ptr owning group if existant. This avoids unintentional creation of multiple owning groups where each eventually tries to delete the AbstractData on its own (which will certainly not work)
* Updated DataContainer implementation to use a hash map instead of an unordered map.

Enforced update of min/max/singleStep values in AbstractAdjusterWidget to be performed in Qt main thread through additional indirection via Qt queued signals.

Refactor reference counting

* Introduced two new tgt::LogManager log levels LuaInfo and LuaError.
* ScriptingWidget registers itself as logger and prints the Lua output into the console window.

* Added OrCombinedPointPredicate implementation
* Updated default settings in PredicateDemoCarotid2 pipeline

(Apparently, I really need some rest...)

Itk reader

ITK Image reader that supports many more image formats.
Example usage edited into the itkfilterdemo pipeline.

 * supports all file formats that can be read via ITK
 * does not support image series

* SliceExtractor FitToWindow property defaults to true to mimic old behavior per default
* PointPredicateRenderArea renders y axis label

* Now supports optional scaling and offset of image
* Added properties for geometry render style and size
* Fixed some scribbling-related bugs

Slice extractor scribbe fix

as discussed

Datastructures

basic datastructures for Matrix and position data

Slicerenderer2d

slice renderer that applies transfer function, clips image and/or inverts axes.
tested only with grayscale input images, but should support color and images as well.

* undo changes to .gitignore (regarding SWIG temporary files)
* moved implementation of PositionData and TransformData from header to source file

Mhdreader fix

Sorry for the huge commit - only couple of files changed (see commit) :-(