Lots of tests/testing and pattern support should be decent now:

- FEATURES: updated
- imports.c: bugfix
- pattern.c: lots of changes to make most patterns work
- templates.[ch]: added xsltEvalXPathPredicate() for predicate testing
- transform.c: cleanup and attribute patterns testing
- xslt.c: added xsltFreeStylesheetList() and now cleanup
  the imports
- tests/REC/test-2.3* tests/REC/test-2.6.2*: more tests
- tests/REC/test-5.2-*: 18 pattern tests from the spec, all should
  work now.
Daniel