[GiNaC-list] a few simple useful features

[Krishna Mohan Gundu]

Hello All,

1) I find something like GINAC_DECLARE_REGISTERED_CLASS_INLINE to be
very useful to define virtual member functions like archive, unarchive
etc. inside the class definition. (This macro should not declare these
functions, ofcourse)

2) Should numeric and ex have constructors that take
std::complex<double> to initialize a complex number? This makes
integration of GiNaC into other libraries simpler.

cheers,
Krishna.