refs #1618

refs #1618

- Fix in knot_zone_contents_add_node() - adding dnames to dname
  table may result in freeing dnames already used to hash the node.
- Fix in xfrin_process_axfr_packet() - setting of in_zone variable
  when adding RRSIGs.

refs #1617, #1618

refs #1618

refs #1598

(And one really ugly bug :-)

refs #1579

- Adjusting of NSEC3 nodes was not sufficient. Added:
  - adding dnames to dname table,
  - setting proper owner's node,
  - setting previous nodes.
- Checking NSEC3 nodes.

- Adding to the beginning of the list.

refs #1579, #1558

- Implementation of adding new orphan was wrong/missing!

...but not very successful

fixes #1611

refs #1611

Usage:

system {
   pidfile "/tmp/knot.pid";
}

- Not copying owner, just increasing reference count.