[Ubuntu] GDAL 2.1.3 transition

[Angelos Tzotsos]

Hi all,

I have just completed the transition to GDAL 2.1.3 for Xenial and have 
pushed the packages to experimental ppa.
Please test before we push to unstable. I have already tested those 
packages in OSGeo-Live nightly.
Bas, can you please update the transition tracker?

Best,
Angelos

-- 
Angelos Tzotsos, PhD
OSGeo Charter Member
http://users.ntua.gr/tzotsos