Added a LAST-MODIFIED property to all VEVENTS

git-svn-id: http://svn.code.sf.net/p/mrbs/code/mrbs/trunk@2830 25f7e783-145e-4f2d-a9f8-dd7182bfe9c7
Changed the ORGANIZER in an iCalendar event to be a new email address, defined as $mail_settings['organizer'] and not the creator.   This is to avoid a problem in some mail systems, eg IBM Domino, where an iCalendar event notification email is silently discarded if the organizer's email address is the same as the recipient's

git-svn-id: http://svn.code.sf.net/p/mrbs/code/mrbs/trunk@2831 25f7e783-145e-4f2d-a9f8-dd7182bfe9c7
Added nofollow to robots meta tag.   See SF Bugs #298

git-svn-id: http://svn.code.sf.net/p/mrbs/code/mrbs/trunk@2832 25f7e783-145e-4f2d-a9f8-dd7182bfe9c7