our front-end for boost::format, the class lib::_Fmt
was lacking an reliable specialisation for long and ulong.
This is due to the notorious problem of these types being
of platform dependant size. As a fix, we're speclialising
explicitly for int16_t, int32_t and int64_t and avoid the
common names 'short', 'int' and 'long' alltogether.
And especially for non-64bit-platform (NONPORTABLE)
we add an explicit specialisation for long
some basic types are passed on directly;
for those, we use explicit specialisations
in the implementation file, and a traits template
to mark those cases in the header.
custom types with custom string conversion will
be converted to string; everything else
just becomes a type id
