Collation implementation

[Paolo Bonzini]

> Mind you that libstdc++'s locales hasn't been finished

That's why I asked.  Two libraries that haven't been finished can share
common strategies -- if one has it's code written it's unlikely that
people want to change.

> Maybe  there could be a possibility of using ICU also for this.

Yes, that's what I thought.

Thanks for the pointer.

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