Modify the changelog to a more compact view.
Added a S3 dendlist method to shuffle
added the functions:
* is.dendlist - to check that an object is a dendlist
* as.dendlist - to turn a list to a dendlist
* (hidden) is_null_list
tanglegram - a minor fix to the doc
Make sure that the main untangle functions will return a dendlist (and also that untangle_step_rotate_2side will be able to work with the new untangle_step_rotate_1side output)
Added "untangle" - a master function to control all untangle functions (making it much easier to navigate this feature, as well as use it through %>% piping)
Added tests for empty dendlist
untangle_DendSer - a new untangle function (this time, only for dendlist), for leverging the serialization package for some more heuristics.

Also a few more help-functions: is_null_list, is.dendlist, as.dendlist, DendSer.dendrogram
.Rd files commit