changes for boost 1.53 and cuda 5.0.32
fix for cuda 5.5 bin directory structure
removed inactive code
added texture view functionality for OpenGL 4.3 scm_gl_core. added example use to ex_texture_objects.
* added OpenGL entry points:
  - OpenGL 4.4 core profile
  - ARB_bindless_texture
  - ARB_sparse_texture
  - ARB_compute_variable_group_size
* started OpenGL 4.4 texture clear functionality
* use of multi-bind texture, sampler and image functions internally
* more to come
fixed regression for OpenGL 4.3 support.

- 430 profile now again default
added ARB_bindless_texture support
- the old render_context->make_resident/make_non_resident calls are _deprecated_ and will be removed in a future update. please port to the new API
- new API offers more flexibility of generating multiple resident handles of single resource with different sampler states applied
- adapted ex_texture_objects example accordingly
ex_volume_ray_cast_cuda changes in qt GUI to support improved GUI rendering when applying FXAA