Increasing default number of l.o.s. steps.
Tweaking l.o.s. procedure to increase convergence.
Added Metropolis-Hastings steps to affine sampler class.
Changing burn-in procedure, including using some M-H steps and
gradually increasing the replacement bandwidth.
Adding Metropolis-Hastings steps to l.o.s. guess generation.
Removing extraneous terminal output and tweaking l.o.s. run parameters.
Reducing default number of steps for l.o.s. piecewise-linear model
to 200.
Merge branch 'MH-steps' into develop