longer EPSG WKT2

[Greg Troxel]

EPSG now has an ensemble for ETRS89 and those have many members, e.g.

  https://epsg.org/crs/wkt/id/25830

which are well beyond the 2048 size in the table definition.

I therefore wonder:

  What version of the EPSG database does postgis come with (seems hard
  to find in NEWS?)?

  What is the relationship between the postgis EPSG version and the proj
  EPSG version?

  Should the table fields become larger?  Perhaps 16384?

and

  If postgis depends on proj, why isn't it just using the EPSG database
  from proj?


(This issue was raised by Javier on the proj list.)