Update documentation now that tiff supports saving.

Update documentation now that tiff supports saving.

2006-02-28  Anders Carlsson  <andersca@imendio.com>

        * gdk-pixbuf-io.c:
        Update documentation now that tiff supports saving.

        * io-tiff.c:
        (tiff_load_read):
        (tiff_load_write):
        (tiff_load_seek):
        (tiff_load_close):
        (tiff_load_size):
        (tiff_load_map_file):
        (tiff_load_unmap_file):
        (gdk_pixbuf__tiff_image_stop_load):
        Rename callback functions that are used during loading.

        (tiff_save_read):
        (tiff_save_write):
        (tiff_save_seek):
        (tiff_save_close):
        (tiff_save_size):
        (create_save_context):
        (free_save_context):
        New callback functions which operate on a memory buffer.

        (gdk_pixbuf__tiff_image_save_to_callback):
        Implement saving of pixbufs to tiffs.

        (save_to_file_cb):
        (gdk_pixbuf__tiff_image_save):
        New function that saves a pixbuf to a FILE handle. Uses
        save_to_callback.

        (fill_vtable):
        Add new functions.

        (fill_info):
        Change flags since this module supports writing now.