Refactor the grouping stuff into _group, unfinished
Major refactoring
Add constructor merge_patterns
Add methods subgroup and sort_triples
Documentation
more failing tests
remove done todo
more failing tests
failing test for group sort
comment out warns
sorted_triples should just take one pattern, no loop
improved test
Improve more tests with Test::Deep
Subgrouping the two stars
Test the sorting with a manual process on connected stars
cleanups
Push the return value of sort_triples
update documentation
Loglevel to trace when verbose testing is on