[IMP] rename module "anonymous" to "auth_anonymous" + recategorize auth modules

addons/auth_anonymous/__init__.py

addons/auth_anonymous/__openerp__.py

addons/auth_anonymous/auth_anonymous.xml

addons/auth_anonymous/static/src/js/auth_anonymous.js

addons/auth_anonymous/static/src/xml/auth_anonymous.xml

addons/auth_reset_password/__openerp__.py

addons/auth_signup/__openerp__.py

addons/auth_signup/static/src/xml/auth_signup.xml

addons/portal/__openerp__.py

addons/portal/portal_data.xml

addons/users_ldap/__openerp__.py