[Proj] Update to EPSG database v8.8

[Even Rouault]

Hi,

Just to inform you I've just completed the update to EPSG v8.8 (previous one 
was v8.5) in GDAL trunk ( ​https://trac.osgeo.org/gdal/changeset/32964 ), 
libgeotiff trunk ( ​https://trac.osgeo.org/geotiff/changeset/2714 ) and proj.4 
master ( ​
https://github.com/OSGeo/proj.4/commit/832329a9aadbfcb7f46919c903f7672e719d2a82 
). (and proposed PostGIS spatial_ref_sys.sql : 
https://trac.osgeo.org/postgis/ticket/3427 )

As you can see (proj.4 nad/epsg file is probably the most readable to see the 
diffs), It brings a bunch of new SRS, updated TOWGS84 shifts, etc...

Please report if you notice any issue.

Best regards,

Even

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