Log Message:
Update to 1.0.15. From the changelog:

general:
* omegascript.vim: The list of OmegaScript commands in the vim mode was rather
  out of date, and a few commands were misclassified.  Fix both problems and
  avoid future recurrences by automatically generating those lists from the
  command list in query.cc.

documentation:
* omegascript.html: Document that $date uses UTC.  (ticket#314)

templates:
* query: Link to "xapian.org" rather than "www.xapian.org".
* inc/toptermsjs: Use double-quotes rather than single quotes for parameter
  values on the <script> tag.

portability:
* omindex: Implement correct handling of paths when calling external filter
  programs on Microsoft Windows.