Improve precision on stardate script

There is a possibility that for every 0.1 stardates (8640 seconds),
the final 0.05 stardate would get rounded up (432 seconds). This kind
of inaccuracy is unacceptable by Starfleet standards, so I've reduced
the inaccuracy to 5e-10 stardates or 43.2 microseconds.

sdate

@@ -12,5 +12,5 @@ t = time.time()
 jd = (t / 86400.0 + 40587.5)
 
 # Use the idea that 10 Julian days is equal to 1 stardate
-print ("%05.3f" % jd)[:-1]
+print ("%05.9f" % jd)[:-7]