* src/file-priv.h
(struct _GnumFileSaver): Removed save_to_stream_func member.
(gnum_file_saver_setup): Removed save_to_stream_func argument.

* src/file.h
(gnum_file_saver_new): Removed save_to_stream_func argument.
(gnum_file_saver_supports_save_to_stream): Removed.

* src/file.c
(gnum_file_saver_save_to_stream_real):
New implementation, uses temporary file and gnum_file_saver_save.
(gnum_file_saver_setup): Removed save_to_stream_func argument.
(gnum_file_saver_new): Removed save_to_stream_func argument.
(gnum_file_saver_supports_save_to_stream): Removed.

* src/gui-file.c
(ask_for_file_saver): Show all file savers in format chooser.

* src/bonobo-io.c (gnumeric_bonobo_io_init),
src/plugin-service.c (gnum_plugin_file_saver_new),
src/stf.c (stf_init):
Adjusted to file.h change (removed save_to_stream_func argument).

* src/xml-io.c
(gnumeric_xml_write_workbook_to_stream): Removed.
(xml_init): Adjusted to file.h change.