* fix DoS vulnerabilities in the process of getting a difference between pages.
* fix the bug of unlocking without lock.
* support WILLCOM's mobile agents.
* fix the bug of breaking the path of the cookie when base_url is specified.
* The page editing support script now supports Safari.
* suppress the width/height attributes when the size of an image is unknown.
* options['attach.cache_url'] is introduced. DO NOT use this unless all attached files are safe.
* Do not consider WikiName inside of pre elements.