Re-factored the authentication subsystem to remove the need for JAAS configuration files. WEB-INF/jspwiki.jaas goes away, as does the need for PolicyLoader. Also, responsibilities for web authentication move to WikiServletFilter. Authentication is now configured via jspwiki.properties -- see that file for details. WikiSession API change: getLoginContext() vanishes.
Re-factored the authentication subsystem to remove the need for JAAS configuration files. WEB-INF/jspwiki.jaas goes away, as does the need for PolicyLoader. Also, responsibilities for web authentication move to WikiServletFilter. Authentication is now configured via jspwiki.properties -- see that file for details. WikiSession API change: getLoginContext() vanishes.

git-svn-id: 6c0206e3b9edd104850923da33ebd73b435d374d@643262 13f79535-47bb-0310-9956-ffa450edef68

tateshitah/jspwiki,tateshitah/jspwiki,tateshitah/jspwiki,tateshitah/jspwiki