setantialiasing not working if set too early

[doutriaux1]

429: /lgm/uvcdat/2015-07-06/lib/python2.7/site-packages/vcs/VTKPlots.py:950: UserWarning: no RenderWindow ready, skipping setantialiasing call, please reissue at a later time
429:   warnings.warn("no RenderWindow ready, skipping setantialiasing call, please reissue at a later time")

I think if the rendering window is not present, this call should still set some value somewhere that will be used when the rendering window is created.

[sankhesh]

This issue is fixed with my antialiasing branch and is merged in master.
The antialiasing value is cached and later used when creating the render window

Ref: de85f8f?diff=unified