Using std.algorithm how to uniq and sort a multidimensional array?

[bearophile]

Meta:

> auto tags = tags.flatMap!uniq.array ?

That's another solution. In Phobos a flatMap can be useful (just 
as a zip overload that accepts a function to apply on the pairs, 
named zipWith in haskell: 
http://zvon.org/other/haskell/Outputprelude/zipWith_f.html ).

Bye,
bearophile