WeakRef updated to better support Tango -- and a question

[Bill Baxter]

The unittest in the previous version didn't actually work under Tango... 
oops.  This version also eliminates the string alias and puts imports 
for unittests inside version(UnitTest) {...}

Also I realized Myron Alexander had made a weak ref class a while back 
called WeakObjectReference, and posted under D.announce.  The main 
difference seems to be that his version uses malloc to allocate one 
pointer, whereas I just use a size_t to hold the pointer so that the GC 
won't see it.  Is there some reason why that won't cut it?

Still hoping someone will let me add this to scrapple and/or 
tango.scrapple.  Hint hint.

--bb
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