[Paraview] Icons in menus now shown on Linux

[Utkarsh Ayachit]

If you're on Linux and your ParaView menus are not showing any icons,
here's a possible fix:

http://www.qtcentre.org/archive/index.php/t-38377.html

To summarize, run the following, it might help.

> gconftool-2 --type Boolean --set /desktop/gnome/interface/menus_have_icons True

Utkarsh