Research weight computations

* Added game.research.weightBase constant

* Added view which computes the weights for each in-progress research

* Added view which computes total weights per empire

legacyworlds-server-data/db-structure/tests/admin/040-functions/045-empire-research/070-research-weights-view.sql

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+/*
+ * Test emp.research_weights_view
+ */
+BEGIN;
+	/* Remove foreign keys from the empire research table */
+	ALTER TABLE emp.technologies_v2
+		DROP CONSTRAINT fk_emptech_empire ,
+		DROP CONSTRAINT fk_emptech_technology;
+
+	/* Insert a few records */
+	DELETE FROM emp.technologies_v2;
+	INSERT INTO emp.technologies_v2 (
+			empire_id , technology_name_id ,
+			emptech_state , emptech_points , emptech_priority
+		) VALUES
+			( 1 , 1 , 'RESEARCH' , 0 , 0 ) ,
+			( 1 , 2 , 'RESEARCH' , 0 , 1 ) ,
+			( 1 , 3 , 'RESEARCH' , 0 , 2 ) ,
+			( 1 , 4 , 'RESEARCH' , 0 , 3 ) ,
+			( 1 , 5 , 'RESEARCH' , 0 , 4 ) ,
+			( 1 , 6 , 'PENDING' , NULL , NULL ) ,
+			( 1 , 7 , 'KNOWN' , NULL , NULL );
+
+	/* Set the constant */
+	SELECT sys.uoc_constant( 'game.research.weightBase' , '(test)' , 'Test' , 10.0 );
+
+	/***** TESTS BEGIN HERE *****/
+	SELECT plan( 2 );
+
+	SELECT diag_test_name( 'emp.research_weights_view - Rows present' );
+	SELECT is( COUNT(*)::INT , 5 )
+		FROM emp.research_weights_view;
+
+	SELECT diag_test_name( 'emp.research_weights_view - weight = game.research.weightBase ^ priority' );
+	SELECT is_empty( $$
+		SELECT * FROM emp.research_weights_view
+			WHERE emptech_weight IS NULL
+				OR emptech_weight <> POW( 10 , technology_name_id - 1 )
+	$$ );
+
+	SELECT * FROM finish( );
+ROLLBACK;

legacyworlds-server-data/db-structure/tests/admin/040-functions/045-empire-research/080-research-total-weights-view.sql

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+/*
+ * Test emp.total_mining_weights_view
+ */
+BEGIN;
+	/* Create a table which will server as an alternate source for
+	 * emp.total_weights_view ; the table is not temporary (PostgreSQL
+	 * won't allow replacing the view otherwise), but will be dropped
+	 * on rollback anyway. 
+	 */
+	CREATE TABLE fake_weights(
+		empire_id			INT ,
+		technology_name_id	INT ,
+		emptech_weight		DOUBLE PRECISION
+	);
+	
+	CREATE OR REPLACE VIEW emp.research_weights_view
+		AS SELECT * FROM fake_weights;
+
+	/* Insert fake records for two different empires */
+	INSERT INTO fake_weights VALUES
+		( 1 , 0 , 1 ) ,
+		( 1 , 1 , 2 ) ,
+		( 2 , 0 , 4 ) ,
+		( 2 , 1 , 5 );
+
+	/***** TESTS BEGIN HERE *****/
+	SELECT plan( 1 );
+	
+	SELECT set_eq(
+		$$ SELECT * FROM emp.research_total_weights_view $$ ,
+		$$ VALUES ( 1 , 3.0 ) , ( 2 , 9.0 ) $$
+	);
+
+	SELECT * FROM finish( );
+ROLLBACK;