fix: mappings/VegCore-VegBIEN.csv: mapped DwC year/month/day, which are split-date alternatives to eventDate. this fixes the missing eventDate in FIA.

mappings/VegCore-VegBIEN.csv: mapped subspecies to new taxonverbatim.subspecies for easier access by validations queries

fix: mappings/VegCore-VegBIEN.csv: taxonoccurrence.sourceaccessioncode: need to populate from aggregateOrganismObservationID when only that is available

schemas/vegbien.sql: specimenreplicate.institution_id: renamed to duplicate_institutions_sourcelist_id, as decided in the conference calls (wiki.vegpath.org/2014-03-13_conference_call#schema-changes-2)

mappings/VegCore.htm: regenerated from wiki: rename specimenHolderInstitutions to specimen_duplicate_institutions, as decided in the 2014-03-13 conference call (wiki.vegpath.org/2014-03-13_conference_call#schema-changes-2). note that most schema changes (such as this one) involve mappings changes, which are handled automatically by `inputs/run postprocess; yes|make inputs/{NVS,SALVIAS,TEAM}/test`.

mappings/VegCore-VegBIEN.csv: event__participant: allow multiple event__participant columns

mappings/VegCore-VegBIEN.csv: project_participant: use [!...] negative lookahead assertion so that multiple project_participant columns will properly map to separate projectcontributor rows

moved everything into /trunk/ to create the standard svn layout, for use with tools that require this (eg. git-svn). IMPORTANT: do NOT do an `svn up`. instead, re-use your working copy's existing files with `svn switch` (http://svnbook.red-bean.com/en/1.6/svn.ref.svn.c.switch.html).

mappings/VegCore-VegBIEN.csv: mapped project_participant

mappings/VegCore-VegBIEN.csv: mapped taxon_determination__is_current, taxon_determination__is_original