Initial checkin for new meta courses feature. Please test!

See http://moodle.org/mod/forum/discuss.php?d=17269 for description.

lib/db/postgres7.sql

@@ -36,7 +36,8 @@ CREATE TABLE prefix_course (
    lang varchar(10) NOT NULL default '',
    cost varchar(10) NOT NULL default '',
    timecreated integer NOT NULL default '0',
-   timemodified integer NOT NULL default '0'
+   timemodified integer NOT NULL default '0',
+   meta_course integer NOT NULL default '0'
 );
 
 CREATE UNIQUE INDEX prefix_course_category_sortorder_uk ON prefix_course (category,sortorder);
@@ -380,6 +381,15 @@ CREATE TABLE prefix_user_coursecreators (
    userid int8  NOT NULL default '0'
 );
 
+CREATE TABLE prefix_meta_course (
+	id SERIAL primary key,
+	parent_course integer NOT NULL,
+	child_course integer NOT NULL
+);
+
+CREATE INDEX prefix_meta_course_parent_idx ON prefix_meta_course (parent_course);
+CREATE INDEX prefix_meta_course_child_idx ON prefix_meta_course (child_course);
+
 INSERT INTO prefix_log_display VALUES ('user', 'view', 'user', 'firstname||\' \'||lastname');
 INSERT INTO prefix_log_display VALUES ('course', 'user report', 'user', 'firstname||\' \'||lastname');
 INSERT INTO prefix_log_display VALUES ('course', 'view', 'course', 'fullname');