Reverted change to XML sitemaps stylesheet URL as that was giving issues on multisite installs.
Reverted change to XML sitemap loading as we were no longer exposing some variables that other plugins relied upon.
Fix bug with author sitemap showing for everyone.
Enhancement
No longer save empty meta post variables, issue #463. Clean up of DB is coming in future release, if you want to clean your DB now, see that issue for SQL queries.