Merge branch 'use_more_callsite'

CallSite is a great data-class to store various information on a call
site.

This series generalizes its usage in some place, and remove a old
depreciated API.

This uniformization and cleanup will be useful in future work, like
call-site optimizations and the new constructors

diff --cc src/abstract_compiler.nit
Simple merge

diff --cc src/naive_interpreter.nit
Simple merge

diff --cc src/typing.nit
Simple merge