Changes to Wikit Revision History between r14 and r15

Small patch to enable revision history to be stored in the Wikit TKD file.

This has only been tested with the CGI interface.

'''Cumulative Patches'''
   * http://www.rkeene.org/projects/info/resources/projects/wikit/revisions/wikit-revs-1rsk.diff
   * http://www.rkeene.org/projects/info/resources/projects/wikit/revisions/wikit-revs-2rsk.diff
   * http://www.rkeene.org/projects/info/resources/projects/wikit/revisions/wikit-revs-3rsk.diff
   * http://www.rkeene.org/projects/info/resources/projects/wikit/revisions/wikit-revs-4rsk.diff
   * http://www.rkeene.org/projects/info/resources/projects/wikit/revisions/wikit-revs-5rsk.diff
   * http://www.rkeene.org/projects/info/resources/projects/wikit/revisions/wikit-revs-6rsk.diff
   * http://www.rkeene.org/projects/info/resources/projects/wikit/revisions/wikit-revs-7rsk.diff
   * http://www.rkeene.org/projects/info/resources/projects/wikit/revisions/wikit-revs-8rsk.diff
(blank line)
   * http://www.rkeene.org/projects/info/resources/projects/wikit/revisions/wikit-revs-9rsk.diff
(blank line)
'''Incremental Patches'''
   * http://www.rkeene.org/projects/info/resources/projects/wikit/revisions/wikit-revs-3_to_4rsk.diff
   * http://www.rkeene.org/projects/info/resources/projects/wikit/revisions/wikit-revs-4_to_5rsk.diff
   * http://www.rkeene.org/projects/info/resources/projects/wikit/revisions/wikit-revs-5_to_6rsk.diff
   * http://www.rkeene.org/projects/info/resources/projects/wikit/revisions/wikit-revs-6_to_7rsk.diff
   * http://www.rkeene.org/projects/info/resources/projects/wikit/revisions/wikit-revs-7_to_8rsk.diff
   * http://www.rkeene.org/projects/info/resources/projects/wikit/revisions/wikit-revs-8_to_9rsk.diff

Legend

     Only in r14
     Only in r15
     -->      Modified slightly between r14 and r15