* update documentation
* add integer format support
* support complex types.
* partial template specialization for complex divide.
* support x86 double-extended format (see Hladky's work)
* perhaps rewrite core code in C preprocessor, with C/C++ wrappers.
* complete numeric_limits
* sane handling of overflow / underflow / NaNs.
* handle more general streams, e.g., wide character streams
