_license/LICENSE.TXT: renamed to README.TXT because this actually contains a description of the folder, not license text

schemas/Makefile: removed no longer used rename/%, rotate. use %/install, %/publish instead to manage public schema versions.

schemas/Makefile: removed no longer needed public/uninstall, which is handled more generally by `%/uninstall: vegbien.sql` instead

schemas/Makefile: `%/uninstall: vegbien.sql`: added support for *_validation schema

schemas/Makefile: %/uninstall: split into 2 rules like for %/install, so that different actions can easily be added for the public schema

schemas/Makefile: %/publish: support auxiliary *_validation schemas

bugfix: schemas/Makefile: `%/install: vegbien.sql`: need -e before each s/// expression

schemas/Makefile: `%/install: vegbien.sql`: create a custom _validation schema for *each public schema, rather than one for the most recently-created public schema. this allows validations to continue to be run against a previous version of the DB while a new version is being imported.

validation/aggregating/traits/bien3_validations_traits_bien3.sql: include only records from the bien2_traits datasource, to ensure that the scope of all queries is limited to the datasource

validation/aggregating/*/*.sql (the output queries): added `SET search_path TO validation`