docu

git-svn-id: svn://svn.code.sf.net/p/fhem/code/trunk@6018 2b470e98-0d58-463d-a4d8-8e2adae1ed80
THZ: short delay added for willy

git-svn-id: svn://svn.code.sf.net/p/fhem/code/trunk@6019 2b470e98-0d58-463d-a4d8-8e2adae1ed80
git-svn-id: svn://svn.code.sf.net/p/fhem/code/trunk@6020 2b470e98-0d58-463d-a4d8-8e2adae1ed80
honor DURATION in 57_Calendar.pm

git-svn-id: svn://svn.code.sf.net/p/fhem/code/trunk@6021 2b470e98-0d58-463d-a4d8-8e2adae1ed80