* m4/qt.m4: Fix bugs created when splitting the code from
        configure.ac, take QTDIR into account when looking for QtTestLib and
        do not die if it is not found as it is not mandatory
        * qt/poppler-page-transition.cc:
        * qt/poppler-page.cc:
        * qt/poppler-private.h:
        * qt4/tests/Makefile.am:
        * qt4/src/poppler-qt4.h:
        * qt4/src/poppler-page.cc:
        * qt4/src/Makefile.am: Fix mess created my the moving and renaming of
        PageTransition.cc