Hooked up server to suicide if clock offset is too great

Disable offset checking if the maxOffset is set to 0

Rename all instances of Drift to Offset

Note that I switched to Marzullo's algorithm from the intersection algorithm, which still works I can still test that the interval was defined by a majority of clocks.
By the way, you don't need to write err.Error(). Just passing err as the argument for a %s format will do the right thing!