linked list for name resolved data, even on hosts/systems with only IPv4
stacks as this simplifies a lot of code.

memory.h is included everywhere for this.

internally-used name.

when ares fails to resolve a name. This was fixed before but somehow has
fallen out again!

all things up to work with encoded host names internally, as well as keeping
'display names' to show in debug messages. IDN resolves work for me now using
ipv6, ipv4 and ares resolving. Even cookies on IDN sites seem to do right.

usage.