Remove ST_IsValid NOTICE output

[mdavis]

ST_IsValid emits a NOTICE for invalid inputs. This can cause a huge volume of unwanted console output in some situations.

Now that ST_ValidReason is available, it would be good to eliminate the NOTICE output from ST_IsValid.

[dbaston]

Should this just be handled in GEOS-land? Stop emitting the notice here? ​https://github.com/libgeos/geos/blob/master/capi/geos_ts_c.cpp#L689

[mdavis]

Seems reasonable to remove this from GEOS.

[dbaston]

Or, as this is appears to be the only NOTICE that GEOS emits, PostGIS could just not register a GEOS NOTICE handler.

[mdavis]

Let's do both! I hate NOTICEs.

[Paul Ramsey <pramsey@…>]

In 91e5c65/git:

Remove NOTICE when ST_IsValid finds an invalid geometry. Closes #4852