Made email notification, including iCal attachements, work when editing this_and_future series

git-svn-id: http://svn.code.sf.net/p/mrbs/code/mrbs/branches/this_and_future@2714 25f7e783-145e-4f2d-a9f8-dd7182bfe9c7
Made Delete work with this_and_future

git-svn-id: http://svn.code.sf.net/p/mrbs/code/mrbs/branches/this_and_future@2715 25f7e783-145e-4f2d-a9f8-dd7182bfe9c7