force trigger for readingschange

git-svn-id: https://fhem.svn.sourceforge.net/svnroot/fhem/trunk/fhem@2831 2b470e98-0d58-463d-a4d8-8e2adae1ed80
don't update reading for xy if unchanged


git-svn-id: https://fhem.svn.sourceforge.net/svnroot/fhem/trunk/fhem@2832 2b470e98-0d58-463d-a4d8-8e2adae1ed80
MAX: fix associate

git-svn-id: https://fhem.svn.sourceforge.net/svnroot/fhem/trunk/fhem@2833 2b470e98-0d58-463d-a4d8-8e2adae1ed80
actiondetector reading change behavior

git-svn-id: https://fhem.svn.sourceforge.net/svnroot/fhem/trunk/fhem@2834 2b470e98-0d58-463d-a4d8-8e2adae1ed80