DMD 0.160 release

[Daniel Keep]

# AssertExpression's can now take an optional informational string as
the second parameter. Static assert's can, too.

Hooray!

# Added Expression.NewExpression so inner classes can be initialized
more conveniently.

I've never used inner classes, but looks cool.

# Added operator overloading of InExpression.

:O  You rock.  ^_^

Once again, many thanks for the hard work!

	-- Daniel

-- 
Unlike Knuth, I have neither proven or tried the above; it may not even
make sense.

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