Drawing instead of Untitled

[Alan Horkan <horkana maths tcd ie>]

I think in the Save dialog we should prompt with the name Drawing %d
rather than Untitled.

Way more verbose description here
http://bugzilla.gnome.org/show_bug.cgi?id=103415

I uncluded a patch, i could commit it myself but i figured maybe i should
run it past you guys first.

Alan Horkan
http://advogato.org/person/AlanHorkan/