2004-12-04 Hans Breuer <hans@breuer.org>

2004-12-04  Hans Breuer  <hans@breuer.org>

	* objects/standard/image.c : fix the correct warning
	`image_file_name' might be used uninitialized

	* app/filedlg.c : near complete rewrite
	- removed 'related dialog', GtkOptionMenu, most global vars,
	also don't hide the dialog but let it go.
	- added: filter view by extension, hopefully working diagram
	referencing, GtkComboBox usage

	* plug-in/pixbuf/pixbuf.c : switched to dynamic generation
	of im/export filter entries. So the user interface reflects
	the dynamic nature of pixbuf loaders

	* lib/filter.[ch] : implement filter_unregister_*port
	  lib/libdia.def : added new functions
	  plug-ins/cgm/cgm.c plug-ins/dxf/dxf.c
	  plug-ins/hpgl/hpgl.c plug-ins/metapost/metapost.c
	  plug-ins/pstricks/pstricks.c plug-ins/svg/svg.c
	  plug-ins/wpg/wpg.c plug-ins/xfig/xfig.c
	  plug-ins/cairo/cairo.c plug-ins/pixbuf/pixbuf.c :
	use them in _plugin_unload () thus all these plug-ins
	can be loaded used and unloaded during Dia's runtime