[obj]_id	IN:	Raster image identifier (ri_id), returned by GRcreate or GRselect, or GR interface identifier (gr_id), returned by GRstart
	attr_name	IN:	Name of the attribute

	Purpose	Finds the index of a data object's attribute given an attribute name.
	Return value	Returns the index of the attribute if successful and FAIL (or -1) otherwise.
	Description	GRfindattr returns the index of the attribute whose name is specified by the parameter attr_name for the object identified by the parameter obj_id.

	FORTRAN	integer function mgfndat([obj]_id, attr_name)
		integer [obj]_id
		character*(*) attr_name