Split the plpython regression test into test cases arranged by topic, instead

of the previous monolithic setup-create-run sequence, that was apparently
inherited from a previous test infrastructure, but makes working with the
tests and adding new ones weird.

src/pl/plpython/sql/plpython_newline.sql

@@ -0,0 +1,20 @@
+--
+-- Universal Newline Support
+-- 
+
+CREATE OR REPLACE FUNCTION newline_lf() RETURNS integer AS
+E'x = 100\ny = 23\nreturn x + y\n'
+LANGUAGE plpythonu;
+
+CREATE OR REPLACE FUNCTION newline_cr() RETURNS integer AS
+E'x = 100\ry = 23\rreturn x + y\r'
+LANGUAGE plpythonu;
+
+CREATE OR REPLACE FUNCTION newline_crlf() RETURNS integer AS
+E'x = 100\r\ny = 23\r\nreturn x + y\r\n'
+LANGUAGE plpythonu;
+
+
+SELECT newline_lf();
+SELECT newline_cr();
+SELECT newline_crlf();