Revert "Add new API method: `getFeedStats'"

This reverts commit 0192ffe5a5f8254d723cf46e4bda839220191c2c.
having idiots report error 500 because their server is misconfigured is worse than having config.php wide open in case their php is not working
add support for plugins adding API methods
digest: use proper logging, update.php: fix typo