Metacat

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.

Sync access policy between mn -> cn in case where metacat native ui being used to update ap on mn

Consolidate the user/group utitlities code.

Change the element name in the user from "group" to "memberof".
Fixed a bug that in groupadd.

Add methods to handle modify user's attributes.

Complete the method - handleUseradd.