Merge branch 'master' of https://github.com/brigb123/fluorender into yong_experimental
Merge branch 'yong_experimental' of https://github.com/brigb123/fluorender into yong_experimental
Merge branch 'yong_experimental' of https://github.com/brigb123/fluorender into yong_experimental
Merge branch 'yong_experimental' of https://github.com/brigb123/fluorender into yong_experimental
Merge branch 'yong_experimental' of https://github.com/brigb123/fluorender into yong_experimental
added opencl support
simple kernel test passed
added getting opengl textures
Merge branch 'master' into yong_experimental
adding interop test
Merge branch 'yong_experimental' of https://github.com/brigb123/fluorender into yong_experimental
threshold estimation is working
needs improvement on accuracy
improved histogram based thresholding
improved hdr calculation
added separate hdr for view
there are problems of re-assigning arguments for cl kernels
updated prairie xml support
working on prairie format changes
finished adding support to the new pvxml format
merging pvxml
kernel improved, no leak
Merge branch 'yong_experimental' of https://github.com/brigb123/fluorender into yong_experimental

Conflicts:
	fluorender/FluoRender/Formats/pvxml_reader.cpp
included opencl files in CMakeLists.txt