Phantasmal MAPD

The MAPD keeps track of rooms and zones.  Eventual possible uses
include path finding and keeping track of cross-zone connections.  It
isn't privileged, so it can't directly read files or otherwise cause
trouble, though access to its own global array must be carefully
controlled to avoid corruption.  It registers rooms with the objnumd
to permit tracking and avoid namespace conflicts with the EXITD and
potentially other daemons.

API

  init() - this should always give an error when called by a developer

  add_room_object() - this will allow a developer to add a room object
     if it's not already registered.  Under normal circumstances, the
     room definition file will take care of this.  See simple_room's
     create function.

  add_room_number() - takes an object and a number, and associates them
     in MAPD's opinion.  The number must be in an existing, valid
     segment for rooms and the room object must already be known to
     MAPD as a room object but not yet have its number registered.

  set_room_alias() - adds a new name for an object.  This will be used
     only very occasionally.  See how the alias "start room" is handled
     for an example.

  get_room() - this allows a user to check for a room name or
     alias.  Calling it with the object_name() of your object as an
     argument can determine whether the room is successfully
     registered.  Calling it with an alias will also work.  See how
     "start room" is handled for an example.

  remove_room_object - removes the object_name() of the supplied
     object.  This does not work on aliases, so if the object is
     not destructed then the alias will still point to it.

  remove_room_alias - removes a registered alias.

  get_room_by_num - takes an integer room number and returns the
     associated room object.

  add_unq_rooms - this takes a string containing UNQ text and
     a filename, nominally the source of that text.  It parses
     the text and attempts to read it as an UNQ room description.

  segments_in_zone - takes an integer zone and returns a list of
     integer segment numbes.  If the zone is zero, segments for
     rooms outside all zones are returned.  If an invalid zone is
     passed in, nil is returned.

  rooms_in_segment - takes an integer segment identifier and
     returns a list of integer room numbers.  If an invalid
     segment is passed in, nil is returned.

  rooms_in_zone - takes an integer zone number and returns a
     list of integer room numbers.  If an invalid zone is
     given, nil is returned.