move struct bed_t to gpdf-embeddable.{cc,h} (setup_pixmap) remove doc

move struct bed_t to gpdf-embeddable.{cc,h} (setup_pixmap) remove doc

* bonobo-application-x-pdf.cc: move struct bed_t to
gpdf-embeddable.{cc,h}
(setup_pixmap) remove doc parameter. (Get it from view_data param)

* gpdf-embeddable.cc: New files to contain the embeddable class

* gpdf-embeddable.h:

* gpdf.cc (main): remove call to setlocale (done in
gnome_init...), ignore return value of oaf_init, let bonobo_init
figure out which orb to use.

* Link.h: declare some methods as const.
* Link.cc: