* file.c
(gnum_file_opener_setup, gnum_file_opener_new, gnum_file_opener_probe,
gnum_file_opener_open, gnum_file_saver_setup, gnum_file_saver_new,
gnum_file_saver_save, gnum_file_saver_fix_file_name,
register_file_opener, register_file_opener_as_importer,
unregister_file_opener, unregister_file_opener_as_importer,
register_file_saver, register_file_saver_as_default,
unregister_file_saver, get_default_file_saver,
get_file_opener_by_id, get_file_saver_by_id,
get_file_savers, get_file_openers, get_file_importers):
Added gtk-doc style documentation.
(struct _GnumFileOpener, struct _GnumFileOpenerClass,
struct _GnumFileSaver, struct _GnumFileSaverClass): Removed structs
already defined in file-priv.h.

* workbook-view.c
(wb_view_save_as, wb_view_save, wb_view_open, wb_view_open_custom):
Added gtk-doc style documentation.

* file.h
(gnum_file_opener_setup, gnum_file_saver_setup): Declarations moved ...

* file-priv.h: ... here