* www/project_faq.html, doc/user/lj_article.txt: Change some more occurrences of "revision control" to "version control".
Patch by: zbrown
* www/variance-adjusted-patching.html: Same. Also, add an original datestamp, something I'd been meaning to get around to. This is the creation date reflected in our CVS repository and our ChangeLog, and makes it clear for "prior art" purposes that the idea has been out there for a while (probably since before this document, since I'm sure I didn't think of it first).