document alternative TSIG algos, thanks maik
Revert "make sure we don't launch the query distribution thread if configured to run unthreaded"

This reverts commit cfc99d7ea24aa40ca0d8cabd11ca2257626197bf.
honor SOA-EDIT while considering "empty IXFR" fallback, fixes #1835
second attempt to prevent us from launching the distributor thread when attempting to operate unthreaded
we duplicated the ns_t_enums from resolv.h or arpa/nameser.h for no good reason. Shift to QType::enum.
fix test for ns_t rename
Merge branch 'master' of github.com:PowerDNS/pdns into secpoll
recursor security poll is now feature complete. Distributors can set their security domain suffix in PACKAGEVERSION, ie PACKAGEVERSION=3.6.1-2.debian