Upgrade scripts should use CREATE OR REPLACE and the like #111
Description
I was testing 1.4.0 in a database here before it was it was 1.4.0. When I went to upgrade that database to 1.4.1, I got
ERROR: function "spoly" already exists with same argument types
My solution was to change all the "CREATE FUNCTION" statements in the upgrade script to "CREATE OR REPLACE FUNCTION". The upgrade then worked fine. I feel this should be the standard practice for all upgrade scripts, past and future.