organize paraview repo into master and devel branches

With this change uvcdat's master branch will checkout a new
uvcdat-master branch from the paraview github repo, and next will
checkout uvcdat-next.

Before both checked out the r_integration branch.
Merge remote-tracking branch 'devel/split_paraview_repo'

* devel/split_paraview_repo:
  organize paraview repo into master and devel branches