Violating the page size / margins

[jskov]

May I suggest that we render all text that breaks the page margins in
red?

When working with LaTeX documents, it always annoyed me that at
compilation time, one would get a warning about breached margins - but
it wouldn't always be readily visible where the breaches where.

So I figure, if we render text in red when it's outside of the
margins, we'll help the user find and fix these.

Jesper