[Paraview] Add data to the pipeline browser via CLI

[Nicolas Cedilnik]

Hello,

I'm wondering if there is an option somewhere or a CLI argument to 
"open" a file (from the file manager or terminal) in the last opened 
paraview window. Right now it launches a new paraview instance for every 
file I open. My workaround is to use drag'n'drop but I'd be happy avoid 
using the mouse as much as possible.

Thanks,

-- Nicolas