Install module function and Mf2 Parser

Added update_only parameter to install_module function since it can't include module.php when called from a module, which means new modules can only be autoloaded via a new request. Updated Mf2 parser to latest version. Fixed a bug in update.php, Reader module must be created with an owner set so that notifications can be created from the Autoupdate module which requires an owner.
core 6 0