optimizer.

lisp.sgml is a placeholder for Eric Marsden's upcoming contribution.
catalogs.sgml is not yet marked up or integrated.
 It should perhaps become an appendix.

Add date/time parsing procedure (perhaps should be in appendix).
Add time zone information (ditto).
Update keyword list.

 of Norm's Modular Style Sheets and jade/docbook.
From Vince Vielhaber <vev@michvhf.com>.

Split introduction sections into separate files to allow the legal notice
 and notation sections appear in all documents without having the history
 show up everplace too.
Add full list of reserved and non-reserved key words in syntax.sgml.
Add a separate chapter to the admin guide on security.

Fix examples for regex operators.

 from datatype.sgml into separate files.
Add type conversion information.
Format historical release notes.