Previously the source filename of a module was sometimes a binary, this
change ensures it is always an erlang string.
Previously dialyzer did not know not to auto import bifs as it does not
read the compile options from a beam. This change uses an attribute in
the abstract code rather than a compile option so that dialyzer does not
auto import bifs.
We also rename Binary.Chars to String.Chars.
As Binary.Chars was the protocol used for interpolation,
it is semantically correct to have a protocol that works
on strings, instead of raw binaries.
José Valim
James Fish