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 abo...