validation/aggregating/*/*.sql, schemas/vegbien.sql, lib/runscripts/validations.pg.sql.run, inputs/bien2_traits/validations.sql: added _ to beginning of each view name so the validation views would sort at the top in the datasource's tables list. this will also make the validation result sets easily distinguishable from the data tables.

lib/sh/util.sh: stderr_matches(): documented that the purpose of not redirecting fd 2 back to fd 2 is to allow log-filtering out an otherwise-confusing benign error

lib/sh/util.sh: ignore_err_msg(): documented that unlike `|| true`, this suppresses only errors caused by a particular error message, rather than all error exit statuses

bugfix: lib/runscripts/validations.pg.sql.run: updated table match pattern to include the type prefix that validations queries now contain

bugfix: lib/runscripts/validations.pg.sql.run: --table: need to include explicit schema so that matching tables from other schemas are not included

added lib/runscripts/validations.pg.sql.run

lib/sh/util.sh: stdout_contains(): usage: documented that this requires a `{ ... } 41>&1` wrapper

lib/sh/util.sh: stderr2stdout(): clarified that fd 2 is not redirected back to fd 2

bugfix: lib/sh/util.sh: stderr_matches(): need to avoid redirecting stderr and stdout to the same place, because this prevents redirecting stdout back to the original stdout after stderr has been filtered using |

lib/sh/util.sh: local_export_array: renamed to just export_array because this was a replacement for export, not local_export