action.php
 - added timeline-simile-api.js to remove need to access simile site
 - set flag wikihtml based on user settings
 - modified call to get timeline data to use wikihtml flag

getXmlData.php
 - added wkihtml flag parameter
 - if using html on timeline data page then call htmlentities on the data
   and also new routine to do some timeline replacements

plain.php
 - For external links if there is no link name then it is a timeline title
   link and just pass the link decoded to simile software
 - For external links with a name add the link html tags to the decoded link

syntax.php
 - Add hotzone parameters. These will go directly to simile software to
   handle
 - Add test to only display the link to the timeline data file if the user
   has permission to edit the file
 - removed references to unused path

timeline.js
 - Added hotzone parameters
 - if hotzone is on make simile hotzone calls
 - Added use of variables for timeline section sizes for top and bottom
   timelines

New files
 - Added Event_source file
 - Added colored event circle png files