# RCSB_UTILS_TAXONOMY HISTORY
   9-Mar-2019  - V0.10 Created module supporting NCBI taxonomy name lookup
  23-Mar-2019  - V0.11 make cache file names python version specific
  25-Mar-2019  - V0.13 add test for merged taxons
  12-Apr-2019  - V0.14 add tree export method and update version/dependencies
  16-Apr-2019  - V0.15 cast types in tree node lists to string and remove lineage
  17-Apr-2019  - V0.16 Adjust convention for parents and depth of the root node.
  23-Apr-2019  - V0.17 Add filtering tree node list generator
  24-Apr-2019  - V0.18 Exclude synthetic root from exported tree add
                       method to return parent scientific name.
   2-May-2019  - V0.19 improve quote filtering for synonyms and common names.
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