don't create any files


git-svn-id: svn://svn.code.sf.net/p/fhem/code@4597 2b470e98-0d58-463d-a4d8-8e2adae1ed80
fixed initial average calculation
added replaceBatteryForSec command


git-svn-id: svn://svn.code.sf.net/p/fhem/code@4598 2b470e98-0d58-463d-a4d8-8e2adae1ed80