array of title formats?

[saurabhwjha]

Would it be easy to change title_fmt to take an array of formats so that each parameter could get its own? On a related note, the default .2f could be changed to give 2 significant figures in the uncertainty, rather than a fixed decimal place.

[dfm]

I think that the whole "title" interface could probably be revamped to be more publication-ready (see also #94). I mostly use the titles for debugging so I haven't been strongly motivated to implement this but it shouldn't be too hard in principle!