clean + folder reorganisation
tp2 added

	deleted:    AbstractGrinderBench.class
	deleted:    AbstractGrinderTest.class
	deleted:    BenchGrinder.class
	deleted:    Casse.class
	deleted:    Fragmenter.class
	deleted:    Grinder.class
	deleted:    Shape$1.class
	deleted:    Shape.class
	deleted:    Stone.class
	deleted:    TestGrinder.class
	deleted:    User.class
	deleted:    Volumes.class
	renamed:    BenchGrinder.java -> tp1/BenchGrinder.java
	renamed:    Casse.java -> tp1/Casse.java
	renamed:    Fragmenter.java -> tp1/Fragmenter.java
	renamed:    TestGrinder.java -> tp1/TestGrinder.java
	renamed:    User.java -> tp1/User.java
	renamed:    stones.jar -> tp1/stones.jar
	new file:   tp2/Ex1.java
	new file:   tp2/Ex2.java
	new file:   tp2/Ex3.java
	new file:   tp2/Ex4.java
	new file:   tp2/StupidOracle.java
	new file:   tp2/SuperOracle.java
	new file:   tp2/VraimentSuperOracle.java
	new file:   tp2/oracle.jar