Allow saving 1-bit mono TIFFs used in faxes

While working on a GTK+ 3 port of Hildon, I'm upstreaming some patches
from Maemo's repositories. This one is repurposed from:
http://maemo.gitorious.org/hildon/gtk/commit/005de8d5

  From: Christian Dywan <christian@lanedo.com>
  Date: Wed, 20 Jan 2010 11:22:29 +0100
  Subject: [PATCH] Fixes: NB#116221 - Sharing TIF image with Size Option
   Large makes the image much larger than the original one when shared
   to OVI or Flickr.

This patch combined other bits which were removed, and the code was
modified a little.

https://bugzilla.gnome.org/show_bug.cgi?id=578876