Remove functions that obviously don't work.

src/org/nwapw/abacus/number/NaiveNumber.java

@@ -48,13 +48,5 @@ public class NaiveNumber implements Number {
         return new NaiveNumber(1);
     }
 
-    @Override
-    public Number valueOf(int val) {
-        return new NaiveNumber(value);
 }
 
-    @Override
-    public Number valueOf(double val) {
-        return new NaiveNumber(value);
-    }
-}

src/org/nwapw/abacus/number/Number.java

@@ -12,7 +12,4 @@ public interface Number {
     Number zero();
     Number one();
 
-    Number valueOf(int val);
-    Number valueOf(double val);
-
 }