cocopro: made sentence segmentation script default means of handling sentence segmentation (as opposed to munge_c3);
         changed calculation of PRO from supervised via c3 annotations of mention type to unsupervised via a list of PRO-ish words (to ease later likelihood calculation where we don't have full c3 access);
         began debugging issue with likelihood calc of section 46 of dgb;
cocopro: made debug section of calc_likelihood more explicit (and added keys);
cocopro: better topic handling during training (possibly fixes issue with section 46);
cocopro: aligned Makefile with better topic handling in scripts;