Bugfix: negative temp and internal re-design


git-svn-id: https://fhem.svn.sourceforge.net/svnroot/fhem/trunk/fhem@2400 2b470e98-0d58-463d-a4d8-8e2adae1ed80
bugfix toggle virtual actor

git-svn-id: https://fhem.svn.sourceforge.net/svnroot/fhem/trunk/fhem@2401 2b470e98-0d58-463d-a4d8-8e2adae1ed80
move to supported systems, updated documentation

git-svn-id: https://fhem.svn.sourceforge.net/svnroot/fhem/trunk/fhem@2402 2b470e98-0d58-463d-a4d8-8e2adae1ed80
bugfix RC19 parameter

git-svn-id: https://fhem.svn.sourceforge.net/svnroot/fhem/trunk/fhem@2403 2b470e98-0d58-463d-a4d8-8e2adae1ed80