bugfix for duration (sub d)

git-svn-id: https://fhem.svn.sourceforge.net/svnroot/fhem/trunk/fhem@3042 2b470e98-0d58-463d-a4d8-8e2adae1ed80
git-svn-id: https://fhem.svn.sourceforge.net/svnroot/fhem/trunk/fhem@3043 2b470e98-0d58-463d-a4d8-8e2adae1ed80
git-svn-id: https://fhem.svn.sourceforge.net/svnroot/fhem/trunk/fhem@3044 2b470e98-0d58-463d-a4d8-8e2adae1ed80
git-svn-id: https://fhem.svn.sourceforge.net/svnroot/fhem/trunk/fhem@3045 2b470e98-0d58-463d-a4d8-8e2adae1ed80
killing BlockingCall-Child in UndefFn


git-svn-id: https://fhem.svn.sourceforge.net/svnroot/fhem/trunk/fhem@3046 2b470e98-0d58-463d-a4d8-8e2adae1ed80