XfceFileChooser and PreviewFileSelection

[Brian J. Tarricone]

hi all-

i just made some improvements to the gtk 2.2 side of XfceFileChooser, so 
now the entire API should be functional for gtk 2.2, with the exception 
of the XfceFileFilter and shortcut folders stuff (which i'm unlikely to 
implement ever).  XfceFileChooser's API and behaviour is modelled 
closely after gtk 2.4's GtkFileChooser, and it does all that 
PreviewFileSelection does (and more).  i suggest that 
PreviewFileSelection should be considered deprecated in favor of 
XfceFileChooser.  any objections?

for an example of how to use XfceFileChooser, see 
xfce4/xfdesktop/settings/backdrop_settings.c, functions list_add_cb() 
and update_preview_cb().  gtk-docs for the API can be found at
http://xfce.org/~benny/api/libxfcegui4/libxfcegui4-XfceFileChooser.html
the online docs aren't completely up-to-date re: deprecated functions.  
also, xfce_file_chooser_dialog_new() has been renamed to 
xfce_file_chooser_new().

    -brian