Schema changes

This is an ongoing list of *any* changes to *any* DataDict array in a schema_inc in *any* package.

Date	Table	Reason	who
18-NOV-2004	tiki_copyrights	overlooked user_name converted to user_id	spiderr
	tiki_semaphores	was accidentally removed. added back, and some columns renamed for minimal name collision	spiderr
	tiki_tags	data column changed from BLOB to standard TEXT	spiderr
	tiki_content_types	now has complete columns to reverse engineer an content_id	spiderr
	tiki_plugins	has maintainer_url added	spider
	tiki_structures	was moved to Liberty from wiki and generalized with content_id's	spider