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Apparently, glBindAttribLocation() does not work as planned with AMD GPUs. Therefore, all Shaders yielded black images. Replaced all attribute locations with hard-coded ones in the vertex shader and removed corresponding convenience function from cgt::Shader.

refs #382

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* Introducing ParticleFlowRenderer processor implementing a particle simulation using OpenGL transform feedback
* Added tgt::Shader::selectSubroutine()
* Added tgt::VertexArrayObject::getId()

* Introduced tgt::Shader::IgnoreUniformLocationErrorGuard
* Fixed SimpleRaycaster::updateProperties() and OptimizedRaycaster::updateProperties() not calling base class' updateProperties()

Removed deprecated setting of shader directives for geometry shaders in tgt::ShaderManager. This hopefully fixes GeometryRenderer single-pass wireframe rendering on non-permissive GPU drivers.

* Fixed SliceExtractor not rendering Y slice position correctly in XZ-plane mode
* Minor improvements in DataContainerInspector fragment shader and GlGradientVolumeGenerator

C++ implicit conversion rules made ShaderManager::loadSeparate() ambiguous in some cases. So I decided to cut loose ends and completely refactored loading with standard version into ShaderManager::load() and loading with custom version into ShaderManager::loadWithCustomGlslVersion().
ShaderManager::loadSeparate() is no longer available!

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@335 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

 * added gradient fragment shader include
 * implemented first hit normal computation to SimpleRaycaster

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@294 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

* added depth calculation fragment shader

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@234 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@160 bb408c1c-ae56-11e1-83d9-df6b3e0c105e