schemas/vegbien.sql, inputs/SALVIAS/validations.sql: added _plots_06a_list_of_stems, for use in figuring out the diff in _plots_06_list_of_plots_with_stem_measurements

validation/aggregating/plots/bien3_validations_salvias_vegbien.sql: updated to DB

schemas/vegbien.sql: plot: removed explicit column lists added in the autorename of plot.location_id->plot_id

schemas/vegbien.sql: plot: renamed pkey to plot_id. note that the field is autorenamed in all validation views which use it.

schemas/vegbien.sql: locationevent: added autopopulated plot_id column which points to the outermost plot of the locationevent's location

bugfix: schemas/vegbien.sql: locationevent: added missing fkey on place_visit_id

bugfix: schemas/vegbien.sql: _plots_06_list_of_plots_with_stem_measurements: only include stemobservation records which have actual stem IDs, not merely stem-related measurements (DBH, etc.)

validation/aggregating/plots/bien3_validations_salvias_vegbien.sql: added `SET enable_seqscan = off;` to match what is done by rematerialize_out_view() to run the queries properly

validation/aggregating/plots/bien3_validations_salvias_vegbien.sql: updated to DB

bugfix: schemas/vegbien.sql: _plots_06_list_of_plots_with_stem_measurements: LEFT JOIN to project instead of inner joining, to get Postgres to use the right query plan. this is the last change needed to make query #6 runnable.