- xpath.c xpointer.c: XPointer reorder of ranges start/end and
  string-range for empty strings
- test/XPath/docs/str test/XPath/xptr/chaptersrange
  test/XPath/xptr/strrange: augmented the XPointer testsuite
Daniel

Added XPointer:
- configure.in Makefile.am include/makefile.am: adding XPointer
  and XPtrtests target
- xpointer.[ch] : new files for XPointer support
- test/XPath/xptr result/XPath/xptr: added XPointer testsuite and
  more XPath tests
Daniel