* OpenGl based reduction in core tools
* SimilarityMeasure processor stub

* Fixed pointer inconsistencies in ScopedTypedData and ScopedRepresentation

Conflicts:
	application/gui/datacontainerinspectorcanvas.cpp

+ some minor beautifications/fixes

Fixed tgt::FramebufferObject to work with Intel GPUs (for some reason, the Intel OpenGL driver fails generating and binding FBOs when using the core (non-EXT) GL functions).

+ 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.

Merge branch 'OpenGL3-core-refactoring' of /mnt/bigone/git/repositories/berge/campvis into development

fixed CMake error introduced in e1551c26: CAMPVIS_HAS_MODULE_XYZ was no longer defined by CMake

Cleaned up and slightly revised GeometryData API. Cleared the way for non-value semantics. Introducing GeometryDataFactory, a collection of static methods to create standard geometric primitives.

work on Issue #88: cleaned up VertexArrayObject interface. It's now simpler and more straight-forward.

* Adapted shaders to new texture formats

+ Moving the geomteryshader vertex and fragment shader to application folder as they belong to it.
+ Removing unndeeded shader code.
+ Opening braces convention is considered for datacontainerinspectorcanvas.cpp and datacontainerinspectorcanvas.h  also.
+ Reusing textues for color and depth buffers instead of creating and deleting them.
+ adding gettrackball function to trackball event handler.
+ modifying resetcontent, mouse events in datacontainerinspectorcanvas class
+ using one depth buffer for datacontainerinspectorcanvas instead of one for every color buffer
+ using one frame buffer for whole datacontainerinspectorcanvas instead of one for every frame

Also link only to needed ITK modules to reduce linking time.

Issue #250: Make Qt dependency in tgt optional (not needed when building CAMPVis without application)

removed preprocessing dependency from vis module (former dependency was only due to some deprecated code)

 * Finished implementation of empty space skipping
 * Renamed Adaptive Step Size to Intersection Refinement (which is more precise in terms of what it's doing)

No modules were previously enabled by default. As a result, the
application wasn't very useful in the default configuration.

Enable the Vis module by default to make the CAMPVis application
functional out of the box. Additional modules can be marked as default
in the future using the mechanism (SET_DEFAULT_MODULES) introduced in
this commit.

Closes #144

There used to be no way to specify what other modules each module
required in order to work. This led to either compilation or linker
errors that were often not easy to understand.

Introduce a new module-level CMake variable, ThisModDependencies, that a
module can set in its CMake file to indicate what other modules need to
be enabled for it to compile and work properly. If defined,
ThisModDependencies should be a list of strings — the names of required
modules.

Once all available modules have been analysed, the collected dependency
information is used to activate (if necessary) the dependencies of every
enabled module. Transitive and circular dependencies are already
supported in this initial version of our module dependency system.

Unfortunately, when a module gets enabled in the CMake GUI, its
dependencies are only resolved once the Configure button is clicked and
CMake runs again. This is a limitation of CMake in that all
configuration happens offline and it's not possible to react to value
changes immediately.

References #144

Automatic pipeline registration would fail for certain valid ways of
declaring a pipeline:
- if the base pipeline class was qualified with a namespace
- if the pipeline inherited from additional classes
- if the declaration followed coding conventions different than CAMPVis'
  (e.g. no space before :, { on a new line)

Make the regex used to detect pipelines more permissive to handle the
above cases.

Closes #233

Bugs:
- Invalid Enumerator during the rendering mesh
- Problems in deleting the generated color and depth textures.
- Depth darkening still has problem :(

+ update the get function of abstractproperty.h and abstractproperty.cpp to support the const objects.

- Still sufring from invalid enumerator in meshgeomtery rendering.

Resolved Conflicts:
	application/gui/datacontainerinspectorcanvas.cpp
	application/gui/datacontainerinspectorcanvas.h
	application/gui/datacontainerinspectorwidget.cpp
	application/gui/datacontainerinspectorwidget.h
	core/datastructures/imagerepresentationgl.cpp

+ Adding the functionality to rotate the rendered geomtery objects
+ Adding the functionality to set the rendered mesh by the user

- Still there are bugs with shader that I cannot set the color of the rendered mesh in the shader