Default Size / Resolution for Cairo

[srush]

I guess that is what you mean by "higher DPI", right?

I guess the problem is that height also controls line thickness now. It would be nice if that was the same for the same size with PNG / SVG. Maybe PNG could have a seperate scale parameter that defaults to 3 or something. Not sure if this function helps.

Originally posted by @srush in #96 (comment)