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StreamLinesRepresentation: Various fixes and improvements.

Joachim Pouderoux requested to merge jpouderoux/paraview:FixStreamLinesRepresentationWithThickLines into master

1/ Address a bug when using thick lines (width>1) with GL 3.2 core profile. With this profile (used on some systems), glWidthLine() does not have effect and generate an error: one must process line thickness manually. A striped version of the geomtry shader of the OpenGLPolyDataMapper has been reproduced here.

2/ Change the blending equation to support any background color.

3/ Support for actor/user transform.

4/ Add a new "Animate" option to turn the animation ON/OFF.

5/ Tests are also introduced thanks to a new optiow "NumberOfAnimationSteps" which perform a single rendering pass with the given number of steps and then stop updating.

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