Interconnect v4.0FR

Design changes to Contact 1/Lvl wiring due to SV install manual v10.0
revision:
-Added 1N4148 diodes (successor to 1N914 recommended in install manual)
-Changed routing from I1 and I2 pin 9, split to individual diodes

Used wasted pins on I6, bused them all to ground

Added two new spare inputs; Spare 3 goes to each display separately and
Spare 4 runs parallel to both for future expansion.  This uses three new
pins on I4: 3 (PFD), 11 (MFD), and 4 (Spare 4 to both).

IN ORDER TO INSTALL THIS:
-PFD I1P9 already good to go
-Move MFD I2P7 to I2P9
-Connect one wire from I4P1 to the Level switch, and the far side of the
switch to ground