Add ST_Point, ST_PointZ, ST_PointM, ST_PointZM with optional SRID

[mdavis]

For convenience and brevity it would be nice to have POINT constructors that can handle all dimensions, and can include an optional SRID:

ST_Point(X, Y [, srid=0] )
ST_PointZ(X, Y, Z [, srid=0] )
ST_PointM(X, Y, M [, srid=0] )
ST_PointZM(X, Y, Z, M [, srid=0] )

Or perhaps the SRID could be provided as a named parameter, to avoid unintentional errors by using the wrong function name?

See ​discussion on the Dev list. See also #4819.

[Paul Ramsey <pramsey@…>]

In a8d1c64/git:

ST_Point, ST_PointZ, ST_PointM, ST_PointZM, constructors with SRID parameter, references #4859