SLA_DVN - Normalize Vector

ACTION:

Normalize a 3-vector, also giving the modulus (double precision).

CALL:

CALL sla_DVN (V, UV, VM)

GIVEN:

V

D(3)

vector

RETURNED:

UV	D(3)	unit vector in direction of V
VM	D	modulus of V

NOTE:

If the modulus of V is zero, UV is set to zero as well.