taxize v0.9.96

NEW FEATURES

• NatureServe has a new API version; the package natserv (https://docs.ropensci.org/natserv/) has a complete overhaul for the new API - taxize interfaces to NatureServe updated. Only user facing change should be that we've moved to using just the final numeric part of the NatureServe taxonomic identifiers as ELEMENT_GLOBAL.2. part is redundant for every identifier (#823)

MINOR IMPROVEMENTS

• rankagg() and tax_agg() fixes: rankagg() examples now conditional on availability of vegan as it should be, and now real abundance data are used in the example. tax_agg() fixes species name ordering in dune data (#822) work by @jarioksa

BUG FIXES

• fixed a bug in class2tree() (#818) (#820) thx to @adriangeerre for the report & the fix by @trvinh
• fix to worms_downstream(): user encountered a rank name ("phylum (division)") we hadn't dealt with yet for worms (#821) thx @msweetlove for the report