||This is a extension of PathFinder to meet the specific need of the CAC software
||Any object wanting to be searched by a pathfinding algorithm should
implement this interfaces
||The interface implemented by any class that can find the best path between two places on a map.
||This intereface defines the minimum services an object should
provide if the object is to be included in a Path object
||A Set of PathPlace object, i.e. a path
Remember that a Path is computed according a PathUser caracteristics.
||Interface for a single entity able to use a Path.