Allow definition of three separate servo frequencies, primary for servos
1--4, SECONDARY for servos 5 & 6 and TERTIARY for servos 7 & 8.
Defined TERTIARY servo frequency for samara @40Hz to counter aileron 
chatter
Shifted flaperons to servo 7 and 8; moved elevator to servo 6 (assuming 1 
index, not 0-index)