deleted:    src/com/noughtsandcrosses/game/NetworkConnection.java
	Class Field.java redesigned as singleton

		modified:   src/com/noughtsandcrosses/game/Field.java

	Created Client/Server classes but didn't finished

		new file:   src/com/noughtsandcrosses/network/Client.java
		new file:   src/com/noughtsandcrosses/network/Server.java

	And some changed in other classes

		modified:   src/com/noughtsandcrosses/users/Ai.java
		modified:   src/com/noughtsandcrosses/users/Human.java
		modified:   src/com/noughtsandcrosses/users/Users.java
		modified:   src/com/noughtsandcrosses/game/Game.java
		modified:   src/com/noughtsandcrosses/Main.java