* plug-ins/gfig/gfig-dialog.[ch]
* plug-ins/gfig/gfig-poly.[ch]
* plug-ins/gfig/gfig-spiral.[ch]
* plug-ins/gfig/gfig-star.[ch]
* plug-ins/gfig/gfig.h: first step of moving all the hidden popup
  dialogs for the tool options in a GtkNotebook showing the options
  within one page for each tool.