Deadwood snapshot update

This now works in Deadwood:

upstream_servers["."] = "10.1.2.3, 10.1.2.4"
upstream_servers["example.com."] = "192.168.199.21"

Here, anything ending in "example.com" (like "www.example.com", "www.foo.example.com", etc.) is resolved by the DNS server at 192.168.199.21; everything else is resolved by 10.1.2.3 or 10.1.2.4.

It can be seen at maradns.org/deadwood/snap

Next:

• Document
• Test
• More helpful error message when there is something like upstream_servers["example.com"] = "192.168.199.32" (no dot after "com")
• Release Deadwood 2.4.02