bugfix: schemas/vegbien.sql: commconcept: added missing unique constraint on commdescription, which is also an identifying field in addition to the ID (which is in commname.commname)

bugfix: schemas/vegbien.sql: locationevent__communities(): inner-join to commdetermination instead of left-joining, so that this does not produce community entries (which occur because there is one commclass per locationevent, but only some commclasses will then have a commdetermination)

schemas/vegbien.sql: projectcontributor: added missing unique constraint

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).

schemas/vegbien.sql: plot.**, analytical_stem_view, analytical_plot: added project_contributors

schemas/vegbien.sql: added project_contributors()

schemas/vegbien.sql: analytical_stem_view: scientificName_verbatim: don't use taxonverbatim.taxonname+author as the scientificName_verbatim if only the author is provided. (this lead to weird scientificName_verbatims that contain just the author.)

bugfix: schemas/vegbien.sql: location: use the place_id from the parent location when no place_id is specified. this fixes a bug in analytical_stem_view where the parent location's place_id was used because it was sometimes missing from the sublocation, but the parent place_id itself was sometimes missing instead if sublocations each had their own place information. this way, it is always available directly in the sublocation, populated from the parent location if needed.

bugfix: schemas/vegbien.sql: location: added place_id which is autopopulated from the current locationplace. join on this in plot.**, to avoid a 1:many join when a location has multiple locationplaces.

bugfix: schemas/vegbien.sql: locationevent_unique_within_parent_by_location unique index: need COALESCE around location_id since it's nullable