backend renderer.

The bindings are currently unstable - you can expect substantial change
in both source and binary interfaces.

The Arthur renderer currently does a reasonable job of rendering path
and fill, but the image rendering doesn't work (for reasons that aren't
clear to me) and text rendering doesn't use the right glyphs - it just
draws with the current font. There is a lot of work to do on this
too. Help is, of coure, welcome.

        Patch from Stanislav Brabec <sbrabec@suse.cz>:

        * configure.ac:
        * poppler-cairo.pc.in:
        * poppler-glib.pc.in:
        * poppler-qt.pc.in:
        * poppler-splash.pc.in: Misc fixes to pkg-config files.

        * glib/Makefile.am (libpoppler_glib_la_LIBADD): Link poppler-glib
        against poppler.

        * qt/Makefile.am (libpoppler_qt_la_LIBADD): Ditto for qt.

        * poppler-glib.pc (Libs): Drop -lpoppler from link.

        * poppler-qt.pc (Libs): Ditto for qt.

        * configure.ac: Test for both libqt-mt.la and libqt-mt.so in that
        order.

        * poppler-qt.pc.in (Libs): Add -lpoppler to Libs.

        * Makefile.am, configure.ac: Add configuration for qt wrapper.

        * poppler-qt.pc.in:
        * qt/Makefile.am:
        * qt/poppler-document.cc:
        * qt/poppler-page.cc:
        * qt/poppler-private.h:
        * qt/poppler-qt.h:
        * qt/test-poppler-qt.cpp:
        New files.