External format of integers (OTP-8540)

[yarsanukayev]

Hello!

With my fork, I've committed a minor change which enables one to make use of all 32 bits of integer while marshalling. See OTP-8540 here.

I've performed tests found in <bert>/test/ directory, none emitted a failure, I have also performed some manual tests and it seems that changeset doesn't affect the library functioning in any way.

Thanks.