[Proj] EPSG v9.0 upgrade

[Even Rouault]

Hi,

I've updated to the EPSG v9.0 database.

The relevant tickets are:
* libgeotiff: https://trac.osgeo.org/geotiff/ticket/83
* GDAL: https://trac.osgeo.org/gdal/ticket/6772
* proj.4: proj.4: ​https://github.com/OSGeo/proj.4/issues/477
* postgis: ​https://trac.osgeo.org/postgis/ticket/3684 (patch submitted)

Combined with that update, I've also applied datum shift overrides for EPSG:4149 (CH1903), 
EPSG:3844 (Pulkovo 1942(58) / Stereo70 Romania), EPSG:31251,31252,31253 (MGI (Ferro) / 
Austria), EPSG:2397/2398/2399 (Pulkovo 1942(83) / 3-degree Gauss-Kruger zone 3,4,5), EPSG:
2065 (S-JTSK (Ferro) / Krovak).

Those were awaiting in various GDAL/libgeotif/proj tickets (*), and were not doable until now 
for most of them, since there was no possibility of defining datum shift overrides specific to 
projected coordinate systems, before the changes done in https://trac.osgeo.org/geotiff/
changeset/2747 and
https://trac.osgeo.org/gdal/changeset/37080

Even


(*) From libgeotiff ChangeLog:

2017-01-10 Even Rouault <even dot rouault at spatialys dot com>

	* csv/datum_shift_pref.csv: add overrides for PCS 2065
	(S-JTSK (Ferro) / Krovak)
	Fixes https://trac.osgeo.org/gdal/ticket/4762 and
	https://github.com/OSGeo/proj.4/issues/185

2017-01-10 Even Rouault <even dot rouault at spatialys dot com>

	* csv/datum_shift_pref.csv: add overrides for PCS 2397/2398/2399
	(Pulkovo 1942(83) / 3-degree Gauss-Kruger zone 3,4,5)
	Fixes https://github.com/OSGeo/proj.4/issues/235

2017-01-10 Even Rouault <even dot rouault at spatialys dot com>

	* csv/datum_shift_pref.csv: add overrides for PCS 31251,31252,31253
	(MGI (Ferro) / Austria)
	Fixes https://github.com/OSGeo/proj.4/issues/254

2017-01-10 Even Rouault <even dot rouault at spatialys dot com>

	* csv/build_pcs.py, csv/datum_shift_pref.csv: add mechanism to define
	TOWGS84 parameters per PCS (instead of only relying on the TOWGS84
	parameters of the underlying GCS).
	Add override for EPSG:3844 ("Pulkovo 1942(58) / Stereo70" Romania)
	Fixes https://trac.osgeo.org/geotiff/ticket/52

2017-01-10 Even Rouault <even dot rouault at spatialys dot com>

	* csv/datum_shift_pref.csv: add override for CH1903 (EPSG:4149)
	Fixes https://trac.osgeo.org/geotiff/ticket/73


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