rc-3

Reworked part of the layouts of both caravel and caravan to move

the clocking subcircuit from inside the pad area near the "clock"
pin to under the DLL.  This prevents the DLL from having its
outputs travel all the way across the chip to reach the clocking
cell and then have the multiplexed clock travel all the way back,
especially as the DLL outputs are high-speed signals (up to 150
MHz).