New Feature: Lesson Dependency

In a lesson's settings one can now set the current lesson to be dependent on another lesson in the same course.  Then, the user can set the conditions for the dependency.  Currently the conditions are time spent, grade better than X, and completed (yes/no).

mod/lesson/db/postgres7.sql

@@ -6,6 +6,8 @@ CREATE TABLE prefix_lesson (
   modattempts INT4 NOT NULL DEFAULT '0',
   usepassword INT  NOT NULL DEFAULT '0',
   password VARCHAR(32) NOT NULL default '',
+  dependency INT8 NOT NULL DEFAULT '0',
+  conditions text NOT NULL DEFAULT '',
   grade INT NOT NULL default '0',
   custom INT  NOT NULL DEFAULT '0',
   ongoing INT  NOT NULL DEFAULT '0',