Use a fixed-width font for the wiki text editor (BB-6721)
The wiki editor is not using fixed-width font. However this "Create issue" editor is using one.
I suspect it would be better if the wiki editor uses a fixed-width font, so we can put in pre-formatted blocks (e.g. source code) more easily.
Or perhaps it's a bug. I'm using Mac OS X 10.7.5 with Google Chrome 23.0.1271.91