possible mem leak patch from Jason Adams integrated xf:escape-uri() from

* xpath.c: possible mem leak patch from Jason Adams
* xpath.c: integrated xf:escape-uri() from Wesley Terpstra
  in the XQuery namespace
* configure.in: preparing 2.4.24
* doc/*.html: updated the web pages
* python/generator.py: closing bug #85258 by generating conditional
  compile check to avoid linking to routines not configured in.
Daniel
20 files changed