Fixed bug 5157 (Nautilus won't display directories for
	which it thinks it doesn't have permissions)

	I removed the code that prevented Nautilus from even
	trying to load a location for which the perceived
	permissions didn't allow reading (because the perceived
	permissions can be wrong with some file systems). Now
	it always tries, and puts up an error dialog only if
	it gets an error while actually loading the directory.

	* src/file-manager/fm-error-reporting.h:
	* src/file-manager/fm-error-reporting.c:
	(fm_report_error_loading_directory): New function, currently
	only handles GNOME_VFS_ERROR_ACCESS_DENIED and a fallback
	default case.
	(fm_report_error_renaming_file), (fm_report_error_setting_group),
	(fm_report_error_setting_owner),
	(fm_report_error_setting_permissions), (rename_callback):
	All the report_error functions now take a parent-window
	parameter (which is often NULL). Also, they now all use
	gnome_vfs_error_result_to_string when whining about
	unhandled cases.

	* src/file-manager/fm-directory-view.h: Changed comments
	and copyright notice only.
	* src/file-manager/fm-directory-view.c:
	(real_load_error): New function, calls
	fm_report_error_loading_directory unless an error has already
	been reported for the current directory load operation.
	(fm_directory_view_initialize_class): Wire up real_load_error
	as default handler for LOAD_ERROR signal.
	(activate_callback): Pass parent window to error-reporting call.
	(load_directory): Reset the reported_load_error boolean since
	we're about to load anew.

	* src/file-manager/fm-properties-window.c: (rename_callback),
	(group_change_callback), (owner_change_callback),
	(permission_change_callback):
	Pass parent window to error-reporting-calls. I just passed NULL
	if it was not trivial to pass a good window.

	* src/nautilus-window-manage-views.c:
	(handle_unreadable_location), (open_location): Remove code that
	was preventing "unreadable" locations from being loaded.