* libgimpwidgets/gimpresolutionentry.[ch]: spiffy new widget that given
	a physical size, displays that size in an arbitrary unit, and lets
	you select a resolution via changing either the corresponding width
	and height or specifying it directly in pixels per your chosen unit.

	* libgimpwidgets/Makefile.am
	* libgimpwidgets/gimpwidgets.def
	* libgimpwidgets/gimpwidgets.h
	* libgimpwidgets/gimpwidgetstypes.h: added appropriate files, function,
	headers, and types, respectively

	* devel-docs/libgimpwidgets/libgimpwidgets.types: added
	gimp_resolution_entry_get_type.  A section still needs to be created
	for it.

	* plug-ins/common/poppler.c (run): bugfix that accidentally wasn't
	merged in previous commit.

	* plug-ins/common/poppler.c (load_dialog): replaced resolution
	spinbutton with a GimpResolutionEntry.