added an encoding "special comment" to avoid warning message in python2.3

* python/drv_libxml.py: added an encoding "special comment" to avoid
  warning message in python2.3 (bug 146889)
* Makefile.am, python/Makefile.am, python/tests/Makefile.am: small
  change to make "make tests" a little quieter (MAKEFLAGS+=--silent)
* xpath.c: enhanced to take advantage of current libxslt handling
  of tmpRVT.  Fixes bug 145547.

python/Makefile.am

@@ -69,5 +69,5 @@ else
 all: 
 endif
 tests test: all
-	cd tests && $(MAKE) tests
+	cd tests && $(MAKE) MAKEFLAGS+=--silent tests
 

python/drv_libxml2.py

@@ -1,3 +1,4 @@
+# -*- coding: iso-8859-1 -*-
 """ A SAX2 driver for libxml2, on top of it's XmlReader API
 
 USAGE

python/tests/Makefile.am

@@ -46,7 +46,7 @@ EXTRA_DIST = $(PYTESTS) $(XMLS)
 
 if WITH_PYTHON
 tests: $(PYTESTS)
-	echo "## running Python regression tests"
+	@echo "## running Python regression tests"
 	-@(PYTHONPATH="..:../.libs:$(srcdir)/..:$$PYTHONPATH" ; \
 	   export PYTHONPATH; \
 	   for test in $(PYTESTS) ; \