[Geotiff] Migration to git and hosting on GitHub

[Even Rouault]

Hi,

Interpreting the absence of opposition as approval, 
I declare https://github.com/OSGeo/libgeotiff to be the new home for 
libgeotiff code hosting and issue tracking.

I've updated the Trac page to point to it.

I'll soon merge https://github.com/OSGeo/libgeotiff/pull/2 if nobody objects.

Even

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