[Proj] C++ coding practices w.r.t object ownership

[Even Rouault]

On dimanche 27 mai 2018 18:05:14 CEST Martin Desruisseaux wrote:
> Hello Even
> 
> Thanks for this first draft, it looks promising!
> 
> One quick comment: it may be worth to move CI_Citation, EX_Extent and
> MD_Identifier, currently in "common", to their own "metadata" package.

OK, done

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