- Reorganized groups.
- Updated main page.

refs #1996 @30m

- If node was empty no action was taken, but all RRs from node in the other tree
  have to be added to ADD section of changeset in such a case.
- Renamed and moved functions for clarity.

Divided into two parts. In first part the 'prev' pointers are
set. The second does the rest of the work. It's necessary because
the 'prev' pointers are used in search for domain names in RDATA
and may not be yet set well. This caused some rare problems.

refs #1952 @4h

This allows to clear any existing requests in the queue,
preventing potential memory leaks on shutdown.

refs #1976

- Logging section completed
- Added examples for remotes and zones
- typo fixes
- needs review

Refs #1997

refs #1877

refs #1877

refs #1877

Formatting and typo.

refs #1877

refs #1877

refs #1877

refs #1877

- Updated introduction.
- Removed 'Security Considerations' chapter and Appendix B.
- Updated authors.
- Fixed case in section names.

refs #1877 @1h

refs #1877

refs #1877

refs #1877

refs #1877

refs #1877

refs #1976

This way it retains a valid pointer to it's configuration when server reloads and
zone gets discarded.

refs #1976

Removed zone lookup from config, as it's being removed from the global conf and moved directly to the zone data.

refs #1976

Missing RCU unlock + replaced numbers by error codes.

cov#10633 cov#10634

refs #1976

refs #1976

refs #1976

refs #1976

refs #1976

This reverts commit 243d4ac1.