* Implement MRL handling for file, disc and network
* Moved input slave option to the global dialog (not file specific and
  avoid cluttering the file subpanel)
* Initial implementation of the network panel based on ideas and work by
  Leo Spalteholz. Thanks !
* Improve layouting and handling of the advanced options subpanel

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M    modules/gui/qt4/dialogs/open.cpp
M    modules/gui/qt4/dialogs/open.hpp
M    modules/gui/qt4/components/open.cpp
M    modules/gui/qt4/components/open.hpp
M    modules/gui/qt4/ui/open_net.ui
M    modules/gui/qt4/ui/open_disk.ui
M    modules/gui/qt4/ui/open_file.ui
M    modules/gui/qt4/ui/open.ui