Small tidy up, delete unused function, old commented-out code.
Bringing in Bayes ubertree.c
Merge branch 'master' of https://github.com/berkeley-cocosci/word-order-phylogeny
And lo!  The postdoc did returneth to his code after many suns and
many moons, and he saw that it was bad.  And he toiled, though the
inscrutible errors did plague him like locusts, and he divided
everything up nicely into .c and .h files in the appropriate manner,
and he made a nice Makefile to compile things properly, and though his
wrists began to ache, he tweaked and tweaked until gcc spake no more,
even when provoked with the dreaded -Wall.

And he saw that it was good.  Well, it wasn't bad.
Replace hash defined lag with a variable, to facilitate future adjustability