Minor fixes for py3k
test
revert mess create by git-bzr
merge with inp
merge inp
solve some issue with opengl and python3
Added GLBarGraphItem example
GLMeshItem accepts ShaderProgram or name of predefined program
Added missing documentation to GLGraphicsItem
minor edits
Python 3 bugfixes
Workaround for pyside bug: https://bugs.launchpad.net/pyqtgraph/+bug/1223173