2.7draft6
* Handle new rank "no rank - terminal" on input
* Generalize elide() and prune() to deal with roots; add detach()
* Tweak conflict report
* Continued futzing with Protozoa and Chromista
2.7draft7
* New reports tax/ott/otu_deprecated.tsv, otu_hidden.tsv, otu_differences.tsv
* Repair another bad bug in setName
* Enhance changeParent to deal properly with roots
* Rewrite the way parent ids are resolved and initialized
* Detect duplicate id assignments in taxonomy file
* Centralize rank field processing in Taxon.init()
* Retrofit make-ott.tsv so that it still works with old version of IF
  (so that we can isolate the effect of upgrading to IF from the
  effects of changes to smasher and make-ott.tsv)
* Move IF's Microsporidia into Fungi
* More futzing with Protozoa and Chromista
* Correct alignment of Coscinodiscus