This splits the rate into a fractional an integer value, which allows the loop to adjust the fractional rate while the integer rate keeps the increments moving properly. Allows the max rate deviation to be independent of the integer rate. Scaling of the differential taps also allows alpha and beta to operate independent of the rate when fractional samples per symbol are used. Slightly more tolerant to large signal values, but they still should be close to +/-1.

More additions to PAM timing simulation.

Cleaning up GRC PAM timing example and adding ability to do M-ary PAM.

Adding channel model to simulation to test frequency offset.

Clipping the rate of the clock recovery helps track large changes.