page number entry widget (for the toolbar)

page number entry widget (for the toolbar)

* xpdf/page-control.c, xpdf/page-control.h: page number entry
widget (for the toolbar)

* xpdf/gpdf-control.cc (gc_page_changed_cb)
(gc_ui_add_page_control, gc_setup_page_control): add a
page-control to the toolbar (currently displays page number only)
(gc_set_ui_pixbufs): extracted from gc_set_ui_container
(gc_setup_view_widgets): renamed from gc_setup_widgets

* xpdf/gpdf-view.cc, xpdf/gpdf-view.h: add a page_changed signal,
wrap g_signal_emit calls for improved readability

* xpdf/Makefile.am (gnome_pdf_viewer_SOURCES): add page-control.c,
page-control.h

* xpdf/gpdf-control-ui.xml: add placeholder for page-control