cleanup function fix

git-svn-id: https://plugins.svn.wordpress.org/events-made-easy/trunk@873687 b8457f37-d9ea-0310-8a92-e5e31aec5664
added an option to show recurrent events only once in lists

git-svn-id: https://plugins.svn.wordpress.org/events-made-easy/trunk@873701 b8457f37-d9ea-0310-8a92-e5e31aec5664