plpgsql: use floor for conversion, add integer tests #736
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See issues #674 and #717.
This corrects the implementation to use floor when converting from degrees to the integer values, and corrects the range checking in the
...ToIntegerfunctions.It also uses the encoding test CSV files to add many more tests for the encoding functions, and adds tests for the conversion of degrees to integer, and encoding from integers.
Tested by pasting
pluscode_functions.sqlandtest_encoding.sqlinto several PostgreSQL interpretors (https://aiven.io/tools/pg-playground, https://db-fiddle.com, https://onecompiler.com/postgresql).