SLA_VN - Normalize Vector

ACTION:

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

CALL:

CALL sla_VN (V, UV, VM)

GIVEN:

V

R(3)

vector

RETURNED:

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

NOTE:

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