Support for calculations on the spheroid on PostGIS & SpatiaLite about geo

[BenMorel]

Some alternatives I'm thinking of:

Alternative to solution 1

• a global $useSpheroid flag on the DatabaseEngine
• if set, all functions that accept use_spheroid=true (PostGIS) or use_ellipsoid=true (SpatiaLite) are automatically flagged when called

The downside of having a global configuration still stands, though. Also, the list of functions accepting this parameter may need to be hardcoded if they differ from one platform to another.

Alternative to solution 2

Make $useSpheroid nullable, and be null by default:

public function distance(Geometry $geometry, ?bool $useSpheroid = null) : float

• if null, the behaviour is the same as now (BC preserved)
• if true or false:
  • on GEOS: throw (setting not supported) (or throw on true only?)
  • on MySQL: throw (setting not supported)
  • on PostGIS & SpatiaLite: apply the spheroid flag if true - false and null being equivalent here