Database management changes

* Added in-base logging through a foreign data wrapper, which is only
possible using PostgreSQL 9.1
* Renamed database-related configuration files to indicate that they are
samples, and added the "real" names to the Git ignore list. Server
distribution modified accordingly.
* Removed PL/PgSQL registration (it was only necessary on 8.4)
* Added pgTAP SQL definitions and a script which will (hopefully) be
executed by the build system after the main Java build in order to
execute database unit tests. The script supports both admin- and user-
level testing. I also added a few tests to make sure the testing framework
actually runs them.
* Added documentation about the database definitions structure

legacyworlds-server-main/data-source.sample.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+	<!-- Legacy Worlds Beta 6 - Default data source configuration -->
+	<!--
+		This file is provided as an example on how to configure the game
+		server's data source.
+	-->
+<beans xmlns="http://www.springframework.org/schema/beans"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="
+                        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
+
+	<bean name="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
+		destroy-method="close">
+		<property name="driverClassName" value="org.postgresql.Driver" />
+		<property name="url" value="jdbc:postgresql:lwb6" />
+		<property name="username" value="lwb6" />
+		<property name="password" value="test" />
+	</bean>
+
+</beans>