Hash changes, take 2

> Hello,
>
> Here are the latest hash changes.  It was easier for me to introduce  
> basicIdentityHash on top of the changes I had done for  
> scaledIdentityHash.  I hope you don't mind.  Also, note I had to  
> change some senders of identityHash.  Martin et al, would you mind  
> reviewing these?  After I wrote the code, I began feeling changing  
> identityHash may not be what we want in general...
>
> Andres.
> <HashChanges2.zip>_______________________________________________
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