Please test: black holes and white holes

[Shin Fujishiro]

I wrote:
> Now it came to my mind that the problem could be solved by inserting
> "alias ReturnType!(C.foo) X;" in generated code. I'll try this.

OK, I did it! I checked in a new version.

> http://code.google.com/p/kabe/source/browse/branches/bhwh/test.d
> http://code.google.com/p/kabe/source/browse/branches/bhwh/nonstd/traits.d
> http://code.google.com/p/kabe/source/browse/branches/bhwh/nonstd/typecons.d

Also, there's a trick to extracting parameter storage classes from a
parameter type tuple (template parameterStorageClasses in traits.d).