vgroup_id	IN:	Vgroup identifier returned by Vattach
	attr_index	IN:	Index of the attribute
	attr_name	OUT:	Name of the attribute
	data_type	OUT:	Data type of the attribute
	count	OUT:	Number of values in the attribute
	size	OUT:	Size, in bytes, of the attribute values.

	Purpose	Retrieves the name, data type, number of values, and value size of an attribute for a vgroup.
	Return value	Returns SUCCEED (or 0) if successful and FAIL (or -1) otherwise.
	Description	Vattrinfo retrieves the name, datatype, number of values, and value size of an attribute identified by its index, attr_index, in the vgroup, vgroup_id. Name, data type, number of values and size are retrieved into the parameters attr_name, data_type, count, and size, respectively.
		If the attribute's name, data type, number of values, or value size are not needed, the corresponding output parameters can be set to NULL.
		The valid value attr_index range from 0 to the total number of attributes attached to a vgroup - 1. The number of vgroup attributes can be obtained using Vnattrs.

	FORTRAN	integer function vfainfo(vgroup_id, attr_index, attr_name, data_type, count, size)
		integer vgroup_id, attr_index, data_type, count, size
		character*(*) attr_name