Fixed regression tests wrt usage of the attributes

Fixed regression tests wrt usage of the attributes

* tests/general/bug-36-inc.xsl tests/general/bug-37-inc.xsl
  tests/general/bug-65-inc.xsl tests/general/bug-100.xsl
  tests/REC/test-15-1.xsl tests/REC/test-7.1.1-3.xsl
  tests/namespaces/extra2.xsl tests/extensions/module.xsl
  tests/plugins/plugin.xsl python/tests/extelem.py
  python/tests/extfunc.py: Fixed regression tests wrt
  usage of the attributes "exclude-result-prefixes"
  and "extension-element-prefixes". test-7.1.1-3.xsl fails
  now, since the code still does not exclude ns-decls
  correctly.