* glom/appwindow.cc: fill_menu_print_layouts(): Show the print layouts
even if the list view is visible.
* glom/mode_data/notebook_data.[h|cc]:
get_found_set_details(): Replace with get_found_set_selected()
which checks the selected record in the list view, if the list
view is visible, instead of just the details view.
* glom/frame_glom.[h|cc]: Remove get_viewing_details().
do_print_layout(): Use get_found_set_selected() so we can print the
print layout for the selected record.

This avoids some confusion caused by the print layouts not being available
when viewing the list instead of the details.
Bug #670462 (alien)