[MetaCRS] PROJ 6.3.1 is released

[Even Rouault]

Hi,

The bugfix release PROJ 6.3.1 is released. 
Download the archives here:

https://download.osgeo.org/proj/proj-6.3.1.tar.gz
( https://download.osgeo.org/proj/proj-6.3.1.tar.gz.md5 ) 
https://download.osgeo.org/proj/proj-6.3.1.zip 
( https://download.osgeo.org/proj/proj-6.3.1.zip.md5 )

See the release notes below.

Updating from 6.3.0 is strongly encouraged, particularly to get the following 
fix:
https://github.com/OSGeo/PROJ/commit/79eed0da28abdc41c996dc55ee231f1fcffe4fd2

Even


————————————

6.3.1 Release Notes
-------------------

 Updates
 -------

 o Update the EPSG database to version 9.8.6

 o Database: add mapping for gg10_smv2.mnt and gg10_sbv2.mnt French grids

 o Database: add mapping for TOR27CSv1.GSB

 Bug fixes
 ---------

 o Fix wrong use of derivingConversionRef() that caused issues with use of
   +init=epsg:XXXX by GDAL (affecting R spatial libraries) or in MapServer

 o fix exporting CoordinateSystem to PROJ JSON with ID

 o projinfo: use No. abbreviation instead of UTF-8 character (#1828)

 o CompoundCRS::identify(): avoid exception when horiz/vertical part is a
   BoundCRS

 o createOperations(): fix dealing with projected 3D CRS whose Z units != 
metre

 o WKT1_GDAL export: limit datum name massaging to names matching EPSG (#1835)

 o unitconvert with mjd time format: avoid potential integer overflow
  (ossfuzz 20072)

 o ProjectedCRS::identify(): fix wrong identification of some ESRI WKT linked
   to units

 o Database: add a geoid_like value for proj_method column of 
grid_alternatives,
   fix related entries and simplify/robustify logic to deal with EPSG
   'Geographic3D to GravityRelatedHeight' methods

 o Fix ingestion of +proj=cea with +k_0 (#1881)

 o Fix performance issue, affecting PROJ.4 string generation of EPSG:7842
   (#1913)

 o Fix identification of ESRI-style datum names starting with D_ but without
   alias (#1911)

 o cart: Avoid discontinuity at poles in the inverse case (#1906)

 o Various updates to make regression test suite pass with gcc on i386 (#1906)


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