inputs/FIA/occurrence_all/: renamed to taxon_observation.** to clarify what an occurrence is. taxon_observation has the same meaning as in VegCore, where each taxon_determination is considered a separate taxon_observation of the associated specimen or vouchered plant (vegpath.org/VegCore/ERD/). (note that having multiple taxon_determinations only makes sense when there is something to reobserve.) the .** is SQL dotpath syntax (wiki.vegpath.org/SQL_dotpaths) for the recursive expansion of all tables to which taxon_observation has forward fkeys (i.e. "the left-join").