* Make num::UpperHex private. I was unable to determine why this struct
is public. The num module itself is not public, and the UpperHex struct
is not referenced anywhere in the core::fmt module. (Only the UpperHex
trait is reference.) num::LowerHex is not public.
* Remove the suffix parameters from the macros that generate integral
display traits.
The code to print the Debug::fmt suffixes was removed when Show was
renamed to Debug. It was an intentional change. From RFC 0565:
* Focus on the *runtime* aspects of a type; repeating information such
as suffixes for integer literals is not generally useful since that
data is readily available from the type definition.
* Because Show was renamed to Debug, rename show! to debug!.
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