LICE =0 printout of first two records of pert.planet tape
LICE =1 no printout of first two records
NPLNT is the planet to be integrated about central body NCENTR.
Position always calculated for body j if KP(j).ge.0.
In addition, velocity also calculated if LVEL=1 for all such
j.  If LVEL=-1, this velocity only calculated for central
body j=NCENTR.