added documentation, many fixes in the H2 fallback
code and H2 stream handling, TLS is enabled by
default using ephemeral key and certificate that
is automatically renewed, but custom certificates
are also supported

this also allows other modules to place code
snippets on the webpage

this allows for efficient variable-interval
running events, so that the timer doesn't have
to be closed and recreated for each iteration

Daemons should be in sbin, make destination variables overridable

According to FHS the 'Non-essential system binaries, e.g., daemons for various network-services.' should be installed in /usr/sbin

Also changed `:=` to `?=` to allow variable override without patching `config.mk`.

See merge request !32

fixed incorrect tagging in rrmap where secure rank would overflow

found by @gdemidov

build: clean tests/mock_cmodule.o



See merge request !30

fixes #77

* SOA MINTTL always preferred for negative answers
* only SOA used for negative answers

refs #75

this is required to avoid REFUSED loops if the origin doesn't handle
minimisation well

previously the buffer for TCP pkt reassembly was
not correctly cleared and fragmented answers
were rejected 

previously, if no subnet was given (127.0.0.0),
it was treated as 127.0.0.0/0. now it is treated
as full address length, e.g. 127.0.0.0/32

After=network.target is still needed because we don't have IP_FREEBIND.

Release cleanup

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See merge request !28

the daemon wrongly freed handle that returned 0,
as in "no more data". this socket is going to be
closed, but it still could be touched by libuv
so it must be freed wit uv_close() handler

when opening an empty database, an invalidated key
value was written resulting in possible corruption
of the cache

fixes #73 small leak in cleaning up per-socket
mempool on daemon exit

tests/test_cache: fix broken test



See merge request !27

layer/iterate: CNAME chain unrolling improvement

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See merge request !26