playing with gen alg; more read output
nicer plot after fit
--force option in per to recalculate the periodogram
limit newton iterations to e<0.8; I think it went nuts sometimes
some tests for get_rvn
gen working for one, two (and more?) planets.

fixed a lot of things in the genetic algorithm; generalized it to
more than one planet; fixed output.
Needs work both on prior ranges and in the way to include more than
one observatory (with vsys for each one).
save fit info after gen; new plot of the fitted curve; minor changes in gen core
playing with parameter priors in gen
trying to do phased curves, nothing yet
working on multinest stuff