* libexslt/saxon.c libexslt/Makefile.am libexslt/exslt.[ch]:
added implementation of SAXON expression(), eval() and
evaluate() functions.
See http://saxon.sourceforge.net/saxon6.4.4/extensions.html
* tests/extension/evaluate.xsl tests/extension/list.{xsl,out}:
modified to use SAXON namespace (functions are not registered
in the LibXSLT namespace)
* tests/exslt/common/object-type.1.out: modified to take account
of the new saxon:expression function