Revision 3682

New Config module.  It will put its course settings in a file simple.conf
along side course.conf.  Changes are:

  URLPath.pm: wiring so the Config module can be called

  ContentGenerator.pm: link in left panel to Config module

  CourseEnvironment.pm: evaluate simple.conf.  File name can be specified
    when creating a new CourseEnvironment.  This allows it to be bypassed
    (which is currently used), or to test a simple settings file (not
    used now, but it might be useful).

  Constants.pm: all data about configuration is stored here.  New values
    can just be added here, unless they are a new type.

  Config.pm: new module for limited course configuration.

Note, it might be better to move the new variable in Constants.pm to
another file.  Committing changes to Constants.pm can be an extra
hassle since it contains some site specific configuration.