Add tasks for all the new languages

Task/Hailstone-sequence/ERRE/hailstone-sequence.erre

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+PROGRAM ULAM
+
+!$DOUBLE
+
+PROCEDURE HAILSTONE(X,PRT%->COUNT)
+   COUNT=1
+   IF PRT% THEN PRINT(X,) END IF
+   REPEAT
+      IF X/2<>INT(X/2) THEN
+          X=X*3+1
+        ELSE
+          X=X/2
+      END IF
+      IF PRT% THEN PRINT(X,) END IF
+      COUNT=COUNT+1
+   UNTIL X=1
+   IF PRT% THEN PRINT END IF
+END PROCEDURE
+
+BEGIN
+   HAILSTONE(27,TRUE->COUNT)
+   PRINT("Sequence length for 27:";COUNT)
+   MAX_COUNT=2
+   NMAX=2
+   FOR I=3 TO 100000 DO
+      HAILSTONE(I,FALSE->COUNT)
+      IF COUNT>MAX_COUNT THEN NMAX=I MAX_COUNT=COUNT END IF
+   END FOR
+   PRINT("Max. number is";NMAX;" with";MAX_COUNT;"elements")
+END PROGRAM