numbers in scarpet better handle long type values.

If possible, numbers that can be represented as longs (seeds, etc) will be handled as longs but they will loose their longinness with a single arithmetic operation.

src/main/java/carpet/script/value/Value.java

@@ -161,7 +161,7 @@ public abstract class Value implements Comparable<Value>, Cloneable
             return new StringValue(value.substring((int)from, (int)to));
         return new StringValue(value.substring((int)from));
     }
-    public double readNumber()
+    public double readDoubleNumber()
     {
         String s = getString();
         try
@@ -176,7 +176,7 @@ public abstract class Value implements Comparable<Value>, Cloneable
 
     public long readInteger()
     {
-        return (long)readNumber();
+        return (long) readDoubleNumber();
     }
 
     public String getTypeString()