Log Message:
Initial import of fluctuate, one of the many packages provided by
brook at biology dot nmsu dot edu and his team at NMSU.

FLUCTUATE fits the model which has a single population which has been
growing (or shrinking) according to an exponential growth law. It
estimates 4Nu and g, where N is the effective population size, u is
the neutral mutation rate per site, and g is the growth rate of the
population.