provide context for error messages. Requires libxml head changes. fixed a

provide context for error messages. Requires libxml head changes. fixed a

* libxslt/documents.c libxslt/extensions.c libxslt/extra.c
  libxslt/functions.c libxslt/imports.c libxslt/keys.c
  libxslt/namespaces.c libxslt/numbers.c libxslt/pattern.c
  libxslt/preproc.c libxslt/templates.c libxslt/transform.c
  libxslt/variables.c libxslt/xslt.c: provide context for
  error messages. Requires libxml head changes.
* libxslt/xsltutils.c libxslt/xsltutils.h: fixed a --profile
  problem
Daniel