spanning_tree_complex. Main set up to compare twisted E3, twisted Kh and normal Kh.
(sseq, module) appropriately; removed algebra/laurentpoly.h and added algebra/multivariate_laurentpoly.h. Added io, muladdeq to Z. Added functions open_file, close_file to lib/io.h. Added operator < to map_wrapper.
now deprecated SVN repository.