* Added automatic copy of inspect.lua to binary directory to CMake build scripts
* Added AbstractPipeline::getProcessor(std::string&)
* Added ScopedSynchronousGlJobExecution guard to Lua command execution to ensure having an OpenGL context present
* Fixed ordering in CampvisApplication::deinit()

refs #386

refs #386

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

The new OpenGL wrapping API allows for full multi-threaded access to OpenGL contexts. Instead of one single thread scheduling all OpenGL jobs for all contexts, the new GlContextManager allows for OpenGL access from multiple threads while ensuring that each OpenGL context is acquired by only one thread at a time.

Detailed list of changes:
* tgt::GlContextManager keeping track of which threads acquire which OpenGL contexts and which threads currently have a context acquired.
* OpenGLJobProcessor does no longer schedules and execute the OpenGL calls for all existing contexts, but only for one single context that can be used for background tasks or other jobs that explicitly need a valid OpenGL context.
* AbstractPipeline now implements the Runnable interface and thus runs in it's own thread. This thread also owns the pipeline's OpenGL context.
* AbstractPipeline has a new pure virtual method executePipeline() that has to perform all computations done by the pipeline.
* AbstractPipeline now takes directly care of calling Painter::paint() of the pipeline's canvas (instead of signalling the Painter). However, the Painter interface needs further cleanup.
* AutoEvaluationPipeline was adapted to the new AbstractPipeline API, hence executing processors is no longer delegated to the OpenGLJobProcessor or the SimpleJobProcessor but entirely done in AutoEvaluationPipeline::executePipeline() and thus in the pipeline's thread.
* Adjusted CampVisApplication, DataContainerInspectorWidget, and GeometryTransferFunctionEditor to the new API.

Replaced DataContainer::s_dataAdded<const std::string&, DataHandle> with DataContainer::s_dataAdded<std::string, DataHandle>.

* Fixed crash (due to nullptr) in DataContainerInspectorWidget if DevIL module not present.

Removed all occasions where references to DataHandles were used, since especially their use in signals may lead to segfaults or other undesired behavior.

* Implemented trackball navigation interaction for rendered geometries
* Implemented correct rendering of textures with correct aspect ration (no longer weirdly stretched textures)
* removed obsolete (because redundant) renderFullscreen option

refs #546
refs #37

* DataContainerInspectorCanvas uses the GeometryRenderer processor to render geometry
* DataContainerInspectorCanvas::_textures now uses DataHandle to improve thread safety avoid segfaults
* replaced some function calls with Qt signals to loose coupling
* removed obsolete fields and methods

refs #546

Removed all code fragments in core code that was ITK specific (conversion from/to GenericImageRepresentationItk). The functionality was replaced by the new conversion functors in imagerepresentationconversionitk.h and imagerepresentationconversionitk.cpp.

refs #553
refs #474

Removed oblivious tgt::QtContextManager and merged functionality into tgt::GLCanvas and tgt::GlContextManager. Meanwhile, improved OpenGL context initialization and pipeline creation in CampvisApplication.

* Added assertion in ImageRepresentationGL constructor checking for matching number of channels

* Rearranged DataContainerInspectorWidget layout to use less space
* Added option to render custom channels in DataContainerInspectorCanvas

* Support read-out of texel values also for 3D images
* introducing tgt::Texture::texelAsFloat() for 3D images
* Fixed Qt crashes in FloatPropertyWidget caused by changing GUI from non-GUI thread

GUI beautification: DataContainerInspectorWidget; Save and load next to each other, hide save if no devil module, disable save btn if no item selected

Various changes to GenericImageReader and the DataContainerInspectorWidgted to get loading arbitrary images into the DataContainer running.

Completely moved the image data handle and histogram computation from the TF to the TF property. Histogram computation is now thread safe.

* Moving to Apache 2.0 license
* Updated AUTHORS.txt

 * added computation of difference image to SimilarityMeasure
 * fixed possible out of bounds access in datacontainerinspectorwidget.cpp
 * added assertions to ImageRepresentationGL constructor

+ Using passthrough.vert and geometryrenderer.frag instead of the meshGeometryRenderer.vert and meshgeometryrenderer.frag
+ adding comments for the destroy function of GeometryTextureInfo and why to use it.
+ Change the depth buffer size changing part of Paint() function in datacontainerinspectorcanvas checking part.
+ Delete the commented codes which are not necessary.
+ Fix the opening braces and removing the redundant parts and only for debugging parts.
+ DVRVis and volumerendererdemo default file is revereted to the original locations.
+ Revert the shaders to the original ones.
+ StartMouseDrag and EndMouseDrag functions of the trackball are replaced with mousePress and mouseRelease.

- Delete the meshGeometryRenderer.vert and meshgeometryrenderer.frag.

# Fixing the bugs of the Color Window in the Canvas

# use 4 spaces instead of tab
# use QString operations instead of unsafe C String operations
# use static_cast casting instead of C casting

# Adding the color under the mouse cursor window and the color value in a line into the Data Inspector Widget.

# Take back the updateInfoWidget to its previous position and add a new updateColor function to just update the Color in the label.

# Add the ability to read the color when hovering the mouse into the canvas and dragging the right mouse button.

# Make a pointer from datacontainerinspectorwidget into datacontainerinspectorcanvas, as we need to call the updateInfoWidget() after updating the color.

# Make the updateInfoWidget() as public to be able to call it.

# Add the Capability to look up the color under the mouse button when one of the mouse buttons is pressed.

# use 4 spaces instead of tab
# use QString operations instead of unsafe C String operations
# use static_cast casting instead of C casting

# Adding the color under the mouse cursor window and the color value in a line into the Data Inspector Widget.

# Take back the updateInfoWidget to its previous position and add a new updateColor function to just update the Color in the label.

# Add the ability to read the color when hovering the mouse into the canvas and dragging the right mouse button.

# Make a pointer from datacontainerinspectorwidget into datacontainerinspectorcanvas, as we need to call the updateInfoWidget() after updating the color.

# Make the updateInfoWidget() as public to be able to call it.

# Add the Capability to look up the color under the mouse button when one of the mouse buttons is pressed.