DV3D keyword error

[doutriaux1]

User get the following annoying warning when using DV3D:

/ssd/src/uvcdat-build/install/lib/python2.7/site-packages/vcs/Canvas.py:3505: UserWarning: Unrecognized vcs plot keyword: cdmsfile, assuming backend (vtk) keyword                                                                                                            
  warnings.warn('Unrecognized vcs plot keyword: %s, assuming backend (%s) keyword'%(keyarg,self.backend.type))

@ThomasMaxwell this is easily preventable by adding the necessary keywords in:

https://github.com/UV-CDAT/uvcdat/blob/master/Packages/vcs/Lib/VTKPlots.py#L50

[ThomasMaxwell]

fixed in branch vcs3D-Fix_vcs_keyword_warning.