Network support for the Lua language

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## DNS

Name resolution functions return all information obtained from the resolver in a table of the form:

> `resolved = {
> name = canonic-name,
> alias = alias-list,
> ip = ip-address-list
> }`

Note that the `alias` list can be empty.

socket.dns.gethostname()

Returns the standard host name for the machine as a string.

socket.dns.tohostname(address)

Converts from IP address to host name.

`Address` can be an IP address or host name.

The function returns a string with the canonic host name of the given `address`, followed by a table with all information returned by the resolver. In case of error, the function returns `nil` followed by an error message.

socket.dns.toip(address)

Converts from host name to IP address.

`Address` can be an IP address or host name.

Returns a string with the first IP address found for `address`, followed by a table with all information returned by the resolver. In case of error, the function returns `nil` followed by an error message.