Make exceptions extend ArithmeticException

Author: mrotteveel

src/main/java/org/firebirdsql/decimal/DecimalInconvertibleException.java

@@ -34,7 +34,7 @@
  *
  * @author <a href="mailto:mark@lawinegevaar.nl">Mark Rotteveel</a>
  */
-public class DecimalInconvertibleException extends RuntimeException {
+public class DecimalInconvertibleException extends ArithmeticException {
 
     private final DecimalType decimalType;
     private final int signum;

src/main/java/org/firebirdsql/decimal/DecimalOverflowException.java

@@ -26,7 +26,7 @@
  *
  * @author <a href="mailto:mark@lawinegevaar.nl">Mark Rotteveel</a>
  */
-public final class DecimalOverflowException extends RuntimeException {
+public final class DecimalOverflowException extends ArithmeticException {
 
     public DecimalOverflowException(String message) {
         super(message);