added schemas/VegCore/Brad_Boyle/bien3_data_provenance_use_cases.docx* from e-mail from Brad

schemas/vegbien.sql: _plots_08_list_of_plots_which_use_percent_cover, _plots_15_pct_cover_of_each_verb_taxon_in_each_plot_in_each_pro: reran with fixes, which removes the incorrectly auto-added copies columns. (they were only able to be auto-added because the tables had no rows.)

bugfix: drop_column(regclass[]): need to run `SELECT NULL::void;` at end of function to avoid folding away functions called in previous query

fix: schemas/util.sql: diff(regclass, regclass): moved try_create() of copies column in parent table to auto_rm_freq() so that it would only happen if both tables actually contain a copies column (otherwise, the try_create() will create an empty copies column if both tables are empty)

schemas/util.sql: try_create(): also handle "child table is missing column" errors

schemas/util.sql: added coalesce(anyarray), which can be used to force evaluation of all values of a COALESCE

schemas/vegbien.sql: implemented _plots_19_count_of_censuses_per_plot_in_each_project

schemas/util.sql: EXCEPTION blocks with multiple exception types: use OR to merge exception types into one WHEN block

schemas/vegbien.sql: public_validations: schema comment: changed "to sync the queries with schemas/vegbien.sql" to "to reset the queries to what's in schemas/vegbien.sql" for clarity

fix: schemas/vegbien.sql: schema comment: to reset the key and value columns for all validations queries: updated running of custom keys() functions to use keys() types instead