[dev] [st] various possible bugs

[Ramana Kumar]

I finally got st to build by just copying the st.info file to the
(missing) st-256color.info file.
First things I noticed:
1. Backspace doesn't work (nor does CTRL-H)
2. Unicode characters don't display properly (the one I noticed is ∀)
3. This one is probably not your problem, but man and vim both
complain about the unrecognized terminal (but I should just set $TERM
to something else I guess).