Move P2_DATA from d to c row
The P2_DATA lines on the row d should be moved to row c. This will
allow the use of a flat cable to connect the various boards on the
backplane making full use of the UD pins. Moving to row c it will be
possible to connect also pin 32 to gnd like on row a.
The J100 should in consequence be moved to the d row, fully connected.
Note that it should not use on the d row pin 31 and 32 that are reserved
for power and gnd (connection to gnd should be preserved).