Default proj log level to none

[jesspav]

Currently, invalid inputs to proj via ST_Transform are resulting in large log dumps to std out.

For example, for a single row:

> SELECT ST_Transform(ST_GeomFromText('POINT (1000 1000)'), 'EPSG:4326', 'EPSG:3857') as geom;
webmerc: Invalid latitude
webmerc: Invalid latitude
webmerc: Invalid latitude
webmerc: Invalid latitude
webmerc: Invalid latitude
webmerc: Invalid latitude
webmerc: Invalid latitude
webmerc: Invalid latitude
webmerc: Invalid latitude
webmerc: Invalid latitude
webmerc: Invalid latitude
webmerc: Invalid latitude
webmerc: Invalid latitude
Execution error: Transform error: PROJ coordinate transformation failed with error: Invalid coordinate

Since we are already capturing and sharing the error message, this change lowers the log level to none/0, but allows users to override it.

After this change, the excess error messages no longer appear and the user can jump straight to the useful error message. For example:

> SELECT ST_Transform(ST_GeomFromText('POINT (1000 1000)'), 'EPSG:4326', 'EPSG:3857') as geom;
Execution error: Transform error: PROJ coordinate transformation failed with error: Invalid coordinate

Tracking issue: #30

[paleolimbot]

Thank you!

(proj_sys is an optional dependency that isn't built in the Python bindings...instead we use the runtime linking feature...I think the suggestions will fix the build)

[jesspav]

Yeah, you are right, I was not thinking about whether the constant I referenced would be available without proj being installed. Good thing the build here caught that.

[paleolimbot]

Thank you!