0.1-7

* fled: a stochastic version of the expectation-maximization method is added to fit the log normal model to the increment core data analyzed by OFAs (method="SEM"). 


* fled: added 'cluster' input argument. A user can now specify whether parallel computing should be used for model parameters estimation; used with OFA analyzed data.


* plot.fled: changed titles to some plots to make those more informative.