* glib/Makefile.am: Create poppler-enums.[ch]

        * glib/poppler.h:
        * glib/poppler-page.cc:
        * glib/poppler-page.h:
        * glib/poppler-action.h: Try to clean up the headers a bit

        * glib/poppler-document.cc:
        * glib/poppler-document.h: Add support for document data.
        Implemented as a lot of GObject properties.

        * glib/poppler-enums.c:
        * glib/poppler-enums.h: New autogenerated files.

        * glib/test-poppler-glib.c: Test the new document metadata.  Seems
        to work nicely, other than the PDF string and View Prefs.

        * poppler/Catalog.cc:
        * poppler/Catalog.h: Extend to support PageLayout.