added delayedUpdate attribute and delayedUpdate and immediateUpdate commands


git-svn-id: svn://svn.code.sf.net/p/fhem/code@4352 2b470e98-0d58-463d-a4d8-8e2adae1ed80
crc fix from htiery (http://forum.fhem.de/index.php/topic,14786.msg112644.html#msg112644)


git-svn-id: svn://svn.code.sf.net/p/fhem/code@4353 2b470e98-0d58-463d-a4d8-8e2adae1ed80