Security role changes, added global repository manager that is the role for administe...

Security role changes, added global repository manager that is the role for administering all repositories configuration wise, the particular repository managers now administer content _in_ their assigned repositories, observers get read access to corresponding repository (or global access to add if they get the global observer) and I also removed the archiva-edit-configuration operation since it was duplicated by the archiva-manage-configuraiton operation

git-svn-id: https://svn.apache.org/repos/asf/maven/archiva/trunk@513431 13f79535-47bb-0310-9956-ffa450edef68