Technology definitions loader

* Added "dummy" data file for technologies (for now it simply copies the
old, line-based technologies) and corresponding XML schema

* Added missing SQL stored procedure to clear all dependencies and
reverse dependencies from a technology

* Added import classes, loader and import tool for the technology graph

* Added tech graph import tool to post-build tests

legacyworlds-server-data/db-structure/tests/user/040-functions/030-tech/040-techdep-clear.sql

@@ -0,0 +1,13 @@
+/*
+ * Test privileges on defs.techdep_remove()
+ */
+BEGIN;
+	SELECT plan( 1 );
+	
+	SELECT diag_test_name( 'defs.techdep_clear() - EXECUTE privilege' );
+	SELECT lives_ok( $$
+		SELECT defs.techdep_clear( '' );
+	$$ );
+	
+	SELECT * FROM finish( );
+ROLLBACK;