Move the compressed files handling from openUrl() to openFile(), this way we can really handle remove compressed files.
Tested with local files only, remove files should work but their download seems to give broken files at the moment (kdelibs bug, I think).

This should hopefully complete the support for compressed files (eg .pdf.gz, .ps.bz2, etc).

svn path=/trunk/KDE/kdegraphics/okular/; revision=693782