As it turns out, showing the history tab only to users with edit privileges
was an easy modification. It simply required adding if
"$this->mTitle->userCanEdit()" to the "if" statement on line
653 of skintemplate.php. The complete
line now reads " if ( $this->mTitle->userCanEdit() &&
$this->mTitle->getArticleId() )"
The more daunting task is controlling who can edit, but that was handily
resolved by installing GroupWiki from
_http://sourceforge.net/projects/groupwiki_
(
http://sourceforge.net/projects/groupwiki) .