/LICENSE.TXT: added note that when redistributing, it recommended to include _license/, so that the open-source proof is included along with the license text (this information should be here as well as in _license/README.TXT because redistributors might not think to look in that file)

/LICENSE.TXT: removed "svn" before "repository" because this would apply equally to a git export of the repository

/LICENSE.TXT: replaced "portions" with "parts" for consistency with the _license/README.TXT wording

_license/README.TXT: clarified that this folder contains authority information proving the open-source status of parts of the codebase. added recommendation to include this folder when redistributing, so that the open-source proof is included along with the license text.

_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