* libxslt/imports.c, libxslt/xsltInternals.h: Changed to
  detect recursion in xslt:include (bug #127687).
* tests/XSLTMark/reverser.out,
* test/docbook/result/xhtml/gdp-handbook.xhtml: results changed
  because of fix of bug #127877 in libxml2 (quotes in text)