add support for saving KoTextAnchors.
That way, pictures are saved at their right position now :)
Thanks jaham for the comments on the mailing list.

BTW, since it's probably my last Summer of Code commit (but of course not my last commit on KWord/KOffice): thanks Sebastian for the mentoring, thanks to the other KOffice guys for their help and support...

(I'm pretty sure there isn't a lot of people reading the commit messages anyway, so thanks to the reader of this message too :) )