Support for making a temporary PostgreSQL instance. Useful for running tests in a clean environment.

Ben Finney 2bacd312e8 Add database-testing Makefile module as of 2008.		%!s(int64=8) %!d(string=hai) anos
bin	88eb412ef1 Remove superfluous manual call to cleanup.	%!s(int64=8) %!d(string=hai) anos
database	2bacd312e8 Add database-testing Makefile module as of 2008.	%!s(int64=8) %!d(string=hai) anos
LICENSE.GPL-3	44ae495475 Add text of GNU GPL v3 license.	%!s(int64=8) %!d(string=hai) anos