Changes in 2.5.1ex

1) Clean up handling of zones

2) Make the removal of the ipsec file upward compatible.

3) Improve CONTINUE policy handling.

4) Implement arp_ignore support.

Changes in 2.5.0ex

1) Make warning and error messages easier to find by using
   capitalization.

2) Remove /etc/shorewall/ipsec and merge it's function with
   /etc/shorewall/zones.

3) Apply small fix to the above patch.

4) Remove dynamic zone support.

5) Add "established policy" support.

6) Add CRITICALHOSTS support.

7) Remove 'bogon' stuff.

8) Implement Macros.