Remove $loopback-address, $local-host, and $local-host-name
Add function local-host-name

These were no constant values, but variables. Additionally, they
confused me multiple times, since initialized by start-sockets(),
which used gethostname and passed that to gethostbyname - which
does not work on poorly configured computers which do not have DNS
or /etc/hosts setup properly.

This also updates all clients in the opendylan repository and updates
the documentation to reflect the changes.
add release note item for network library change
Merge pull request #498 from hannesm/reduce-network-confusion

Remove $loopback-address, $local-host, and $local-host-name