Reviewed code :
-Added a new class (Player)
-Changed NavalBatle constructor
-Added HashCode for Coordinates
-Reviewed comments
-Reviewed NavalBattle methods

Detail :
-Player class : Contain the table of Player's boats and his actions
		Constructor require just a table of the boats and initialize an empty
table for the actions
-NavalBattle : Now based on a table of Player, wich allow to pass
Player's number to the methods
	       Added a method to select a non-played case for a player (used
only while the party is not over, while the player has not played every
positions)
	       Constructor : Only require the 2 tables of boats of both players
-Coordinates : HashCode return x*10 + y
-Main : Deleted Action table (for Player constructor)