update the todo list

/* TODO List

X- Convert all of the authz modules to providers

- Remove the ap_requires field from the request_rec

X- Remove the ap_requires field from the core_dir_config structure

X- Remove the ap_requires field from authz_dir_conf   

X- Remove the function ap_requires() and authz_ap_requires()

   since their functionality is no longer supported 

   authn_alias.  Is there a need for an authz_alias?

X- Remove the Satisfy directive functionality and replace it with the

   <RequireAll>, <RequireOne> directives

- Remove the Satisfy directive 

X- Remove the Satisfy directive 

X- Implement the <RequireAll> <RequireOne> block directives

   to handle the 'and' and 'or' logic for authorization.

X- Remove the AuthzXXXAuthoritative directives from all of

X- Reimplement the host based authorization 'allow', 'deny'

   and 'order' as authz providers   

X- Remove the 'allow', 'deny' and 'order' directives      

- Merge mod_authn_alias into mod_authn_core

- Remove all of the references to the authzxxxAuthoritative

   directives from the documentation

- Remove the Satisfy directive from the documentation

*/

typedef struct provider_alias_rec {