Forward Firewall: fixed 12 Bugs from forum.

Forward Firewall: fixed 12 Bugs from forum.

1) Added more possible chars in remark: : / .
2) Added "Internet" to std networks to be able to define internetaccess
3) When renaming a custom address, the firewallrules get updated
4) Ports are now ignored when using GRE as Protocol
5) When saving a customservice, the cursor is now in first textfield
6) Added a customservices file to installation with predefined services
7) Added ESP as protocol
8) Fixed counterproblem
9) Dropdownboxes for customservices and groups now sorted
10) Firewallrules now sorted in right order
11) fixed a Bug when defining manual address in source and target, the hint message is no longer displayed
12) When defining an external access rule, the last forwardrule was deleted