Fleshed out the fringe stopping code.

Added a fringe-stopping loop that updates the appropriate registers
using the constant delay and phase values entered by the user. Obviously
this doesn't do actual fringe-stopping yet.
Finished the fringe-tracking loop.

Flushed out the set fstop command and added a command for setting
the delay triplets that the DDS hands out to the correlator crates.
Also, added a module for calculating the LST kindly provided by Taco.
Added IDIR to the wideCrate Makefile.
Increased the wideCrate's katcp client call timeout from 20 to 60 s.

This was timing out too early when trying to arm the SOWF using the
absolute time given by the DDS.