vdata_id	IN:	Vdata identifier returned by VSattach
	vdata_name	IN:	Name of the vdata

	Purpose	Assigns a name to a vdata.
	Return value	Returns SUCCEED (or 0) if successful and FAIL (or -1) otherwise.
	Description	VSsetname sets the name of the vdata identified by the parameter vdata_id to the value of the parameter vdata_name.
		At creation, the name of the vdata is NULL. The name may be reset more than once. Vdata names, like class names, can be any character string. They exist solely as a meaningful label for user applications and are not used by the HDF library in any way. Vdata names will be truncated to VSNAMELENMAX (or 64) characters.

	FORTRAN	integer function vsfsnam(vdata_id, vdata_name)
		integer vdata_id
		character*(*) vdata_name