new. register gpdf-zoom-fit-width stock icon with a GtkIconFactory

new. register gpdf-zoom-fit-width stock icon with a GtkIconFactory

* xpdf/gpdf-stock-icons.h, xpdf/gpdf-stock-icons.c: new. register
gpdf-zoom-fit-width stock icon with a GtkIconFactory

* xpdf/fitwidth.png: redone in 24x24pix instead of 26x26, based on
gtk's zoom-out stock icon and the original fitwidth.png

* xpdf/gpdf-control.cc (gc_set_ui_container): s/gc_set_ui_pixbufs/
gc_ui_set_pixbufs/
(gc_ui_set_pixbufs): rewrite to use stock icon machinery, let it
do the correct scaling

* xpdf/bonobo-application-x-pdf.cc (main): init our stock icons

* xpdf/Makefile.am (gnome_pdf_viewer_SOURCES): add
gpdf-stock-icons.[ch]