* mailq: Clarify set of relevant files in README.
* dyndns: Docuument existence in README.
* REAMDE, copyright: Correct locations for GPL, and contact info.
+ * Update to GPLv3+; update copyright notices everywhere.
+ * ipif: Update docs to reflect fact that we are now using tun/tap.
+ * ipif: Deprecate udptunnel.
+ * ipif: Provide head comment of service.c as a txt docs.
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