Convert the data if it isn't already UVF.
Convert the data if it isn't already UVF.

Should be able to get some "download dataset X from web, render
it" type tests going now.

git-svn-id: 83c4c97093aeea62ac982fbfd516bf9db27f5c99@1590 c36c8488-0289-0348-9b64-b301f74bd9a7

BlueBrain/Tuvok,BlueBrain/Tuvok,BlueBrain/Tuvok