start adding open tree vocabulary
clean up conflicts
updating to use project defined relations instead of dc, dwc
fixed study metadata and implemented (I think) otu metadata; added root tag for nodes where appropriate
remove unused taxonSet element generator
added code for tree meta data element(s) - currently only one; also removed some unused functions; improved some comments and docstrs
change to ottolid meta data property - now reports the preottol_taxid per JAR's request to support debugging
change id in nexml root to 'study', add ot:studyid metadata