Metacat

Add code to persist the properties in the group 3.

If the user doesn't exist in the password file, the auth configuration will give an error.

Add a method to get the user management url.

Fixed Exception declaration problem

minor changes to error msgs

When a docid's access policy is modified with metacat native api, update CN with the new access policy

Add a note to the administrator to tell the name format of groups and users.

fix typos/compilation

Change to use AuthFile constructor.

Add code to check if groups is null.