is_blog_installed() improvements and repair.php. see #10728

git-svn-id: https://develop.svn.wordpress.org/trunk@11902 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/wp-db.php

@@ -254,6 +254,16 @@ class wpdb {
 	var $tables = array('users', 'usermeta', 'posts', 'categories', 'post2cat', 'comments', 'links', 'link2cat', 'options',
 			'postmeta', 'terms', 'term_taxonomy', 'term_relationships');
 
+	/**
+	 * List of deprecated WordPress tables
+	 *
+	 * @since 2.9.0
+	 * @access private
+	 * @var array
+	 */
+	var $old_tables = array('categories', 'post2cat', 'link2cat');
+
+	
 	/**
 	 * Format specifiers for DB columns. Columns not listed here default to %s.  Initialized in wp-settings.php.
 	 *