* Merged Title::userCanRead() check in Title::getUserPermissionsErrors()

* Merged Title::userCanRead() check in Title::getUserPermissionsErrors()
* (bug 26020) Setting $wgEmailConfirmToEdit to true no longer removes diffs from recent changes feeds
* Added second parameter to Title::userCan() and Title::quickUserCan() to allow callers to pass the User object to use for checks; this changes Title::userCan()'s second parameter from "do expensive queries" flag to User, but all callers should have been updated in r102183
* Updated callers that might throw a PermissionsError to use getUserPermissionsErrors() instead and pass the error array to the exception
* Refactored duplicate code in missingPermissionError()
* Moved Title::isNamespaceProtected() a bit upper and Title::userCanRead() near Title::userCan() to have related functions in the same location
* Some minor refactoring in permission-related functions in Title