Release of probe firmware 4720

• The method for measuring times (e.g. RTTs) for each measurement has been switched to use a strictly monotonic, relative clock, thereby avoiding the artefacts caused by absolute clock changes due to time synchronisation.
• The RDATA field of a DNS measurement result (in response to a TXT query) is now a list of strings. It was a single string before.
• The cipher list supported by SSL/TLS certificate checks have been refreshed.
• Fixed a bug where one-off results were reported multiple times in some cases.
• Fixed a issue where NTP measurements could generate syntactically incorrect results which, as a consequence, were never stored.
• Fixed an issue where IPv6-only probes did not properly report their network configuration.
• Fixed a bug where failed DNS measurements in some cases did not report the time of measurement.
• The probes, in addition to the infrastructure, now also enforce the restriction that local (RFC1918 and link-local) addresses should not be measured.
• When removing static configuration from a probe, the statically added previous DNS server was still used