schemas/vegbien.sql: location_set_top_plot(): only do the lookup of the parent's top_plot when there is a parent_id

schemas/vegbien.sql: location: added autopopulated top_plot

schemas/vegbien.sql: locationevent: added locationevent_pull_forward_from_parent() trigger which populates project_id from the parent locationevent

schemas/vegbien.sql: locationevent__pull_forward_from_parent(): renamed to locationevent_pull_forward_from_parent_for_stratum() since it actually has a filter that causes it to apply only to stratum events

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()