List GWGs in Interface to send update from
DyndDNS edit: unset vars when no longer used
Allow individual line descriptions on alias bulk import

This enhancement allows the user to make a text file of IP addresses, IP subnets and/or IP ranges, like they have always been able to do, but with this they can put a description after each IP number and that description text will be saved in the alias. All existing functionality without specifying a description is unchanged, so it is backward-compatible.
This is handy when having aliases that are on all my pfSense boxes, I can make 1 text file, bulk import it on every system and now include descriptions of each chunk of IP address space.
Note: The artificial limit of 200 character descriptions is to catch the case where a user pastes a long list or IP addresses, but they are all on 1 line. An error message is given, rather than importing the 1st IP and considered the remaining ones as the description.
Bulk Import: fix copy-paste var name error
Update reserved_keywords checks to match firewall_aliases_edit

firewall_aliases_import should have the same checks for reserved names as firewall_aliases_edit
This code should really be in a function in a common include file, but which one is the appropriate one?
For now I made the checks the same.
Add an option to force a gateway to be down, it fixes #2847
This might also say "icmpv6" here and lead to a bad rule.
Add 'limited' to ntpd restrict list to workaround CVE-2013-5211. It fixes #3384
Check for vertical bars in alias detail descriptions

The descriptions of each entry in an alias are stored in config.xml as a list delimited by "||". So you cannot have "||" in the actual description (or the description effectively splits into the next entry). Also you cannot start or end the description with "|" or it will be very confusing having the config with "|||" in it.
This code validates all that sort of invalid input.
Check for vertical bar at start or end of description