Use access() instead of trying to opening a file to check permissions.
Use access() instead of trying to opening a file to check permissions.

	* src/object/path.cc (exists, readable, writable): Use
	"access" when appropriate.

urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,urbiforge/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi