schemas/vegbien.sql: placerank: Reordered in path order, using <http://rs.tdwg.org/dwc/terms/#dcindex> and <http://vegbank.org/vegbank/views/dba_fielddescription_detail.jsp?view=detail&wparam=1415&entity=dba_fielddescription&params=1415> as a guide. Documented the source of the values.