Item12359: Item12104: Item12360:  LogDispatch updates

 - Add the DESTROY and flock to the EventIterator and eachEventSince
   processing to get share locks on the files.

 - escape newlines when writing to the log, for now &#255;&#10; so that
   the decode doesn't unescape other encoded newlines

 - Modify eachEventSince to return the same format regardless of the log
   level.

git-svn-id: http://svn.foswiki.org/trunk/UnitTestContrib@16435 0b4bb1d4-4e5a-0410-9cc4-b2b747904278