[swarm_ctrl] Updated script to point to the sync-fix bitcode.
[swarm] Added software for enabling the second sideband.

This means using the pre-DDR3 packetizer X-engine output order to
derive the needed sideband states for each baseline given the Walsh
patterns of the Swarm. These states are then written to the appropriate
block memory on the FPGAs.
[swarm/core] Added functions for getting the present integration time.

For both a SwarmMember and the entire Swarm.
[swarm/data] The data loop now properly sends time and length of integration.