an enum inside another enum

[Simen Kjaeraas]

I've also written this implementation of enumerations. It's a bit  
different from normal D enums, but supports inheritance, guarantees unique  
values, as is much more conservative in what conversions and operations it  
allows.

I'm considering adding addition and subtraction of integers as valid  
operations, but I'm not sure I want to.

Feel free to critique, hack, improve upon and otherwise use and abuse the  
code.


--
Simen
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