add facility in Stemma for distance tree alongside hypothesis; use this for group_var...
-rw-r--r-- .gitignore
-rw-r--r-- Makefile.PL
-rw-r--r-- group_vars.pl
drwxr-xr-x lib
-rw-r--r-- make_tradition.pl
drwxr-xr-x script
drwxr-xr-x t