Also removed commented out code.

There are still differences between the erlang io_lib and the trunc_io in
how ~p/~P are handled, but a first step is useful here.

Whenever we have the filename we ALWAYS have the module name, which is
effectively just as useful and already printed.

Tests now pass on both R15B and R14B03.

Thanks for Kostis for helping me figure this one out

This is just silly busy-work since they're library applications, but
whatever.

Additional changes and formatting by Andrew Thompson

Bitstrings are binaries that don't end on an 8 bit boundary, so dealing
with the trailing bits is annoying. Thanks to the bit_size bif we don't
have to resort to io_lib for printing them.

As long as the numeral is not the first character, it shouldn't force
quoting on the atom.  For example, abc123 does not need quotes.

Since the lager_format rewrite, ~p and ~w now have different behaviour
with regard to printing lists as strings.

If the result of the string format was longer than the remaining length,
the returned remaining length would be negative, which would make very
strange things happen.