* [LIST_EXT,NEW] Added replace_nth/6, replace_nth0/5, replace_nth1/5.
Inspired by Lager's SWAPP project I have added an application server to the PGC, which encompasses the following:
  * Authorization architecture
  * User DB
  * Login architecture
  * JSON access to statistics, users.
  * UI access to users, login architecture.
  * Home page

* [APP_HOME,NEW] New home Web page for the new application server.
* [APP_SERVER,NEW] New application Web server.
* [AUTHORIZATION,NEW] New module adding authorization architecture to the application server.
* [DB_EXT,NEW] Added db_read/1 which fails when the read factum does not exist (catching the existence error).
* [DEV_SERVER,EXT] Updated to work together with the new application server.
* [DISPATCH,NEW] New dispatching wrapper for the application server: calls the authentication architecture.
* [LOGIN_API,NEW] Added login infrastructure to the application server. This works together with the dispatching wrapper and authorization architecture.
* [LOGIN_DB,NEW] New persistency store for login information.
* [LOGIN_UI,NEW] New Web page for setting the login API via UI.
* [SERVER_UI,NEW] New module of elements reused by UI Web pages.
* [STATISTICS_API,NEW] New module providing a JSON interface to server statistics.
* [USER_DB,NEW] New persistency store for user information.
* [USERS_API,NEW] New user API using JSON.
* [USERS_UI,NEW] New Web UI for setting the user API.