361. [func] When the RBT find or chain functions set the name and
origin for a node that stores the root label the name is now set to an empty name, instead of ".", to simplify later use of the name and origin by dns_name_concatenate(), dns_name_totext() or dns_name_format(). 360. [func] dns_name_totext() and dns_name_format() now allow an empty name to be passed, which is formatted as "@".
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