Refactoring patches

[Yuriy Skalko]

> I am sorry, but this is causing a load of errors on cygwin. I am going
> to fix it by using docstring.h instead of strfwd.h where necessary.
> 
> The following one is the kind of compile error I get. I am surprised that
> it seems to compile fine with mingw, though.

I suppose it compiles because conditional compilation branch that 
includes <string> is active in MinGW. And probably it is not active in 
Cygwin.

Yuriy
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