Document messages#show (ie parse page) better
Indicate whether a type or friend is new

This is a useful hint when user doesn't expect a type or friend to be
new.

Eg I've been calling Butterlap 'Butterlap', then one day I accidentally
called it 'Butter Lap'. Seeing 'new' next to 'Butter Lap' may alert me
that I've been calling it by a different name up until now.