Add support implicit conversion between types

[Ramon]

I understand and support Kenjis request (linked in this thread) 
in the "no casting, though" version.

And I find "C++ or C# or Foo2k has this!" a very troublesome 
approach and measure.
Whatever feature is introducing inconsistencies is almost never 
worth it.

We do have explicit conversion. If anyone feels that to look ugly 
he should ask what's worse, language inconsistencies or looks.

A+ -R