NEW Adding a configuration option to get the Environment Checker to email its results
BUGFIX: fixing env check code error
ENHANCEMENT: clearer error message when dev/check fails
BUGFIX: fixing bug in FileAgeCheck when checking multiple files
Use ArrayList instead of DataObjectSet for SS3
FEATURE: add one more Environment checker
NEW Cleaned up access checks, allow extension

Logic hasn't changed, but removed duplicate ADMIN check in DevCheckController.
BUGFIX Use httpError() in EnvironmentChecker

Security::permissionFailure() relies on the object extending Controller,
not RequestHandler, since it wants to use the redirect() API.