- Added function zone_find_previous().
- Added searching for previous node when asked for NSEC records
  in some nameserver functions.
- Searching in tree separated.
- Minor changes to nameserver NSEC/NSEC3 functions (checking if
  NSEC3 is enabled)

refs #606

Conflicts:
	.gitignore
	Knot.files
	Makefile
	src/dnslib/zone-dump.c
	src/dnslib/zone-load.c
	src/dnslib/zone.c
	src/dnslib/zone.h
	src/other/debug.h
	src/other/log.c
	src/server/name-server.c
	src/server/server.c

Added missing files to makefile, disabled hash table (bug).
Added dependency on libcrypto (OpenSSL).
Various other fixes.

+ Small fix in dnslib_zone_find_nsec3_for_name()

refs #424

Conflicts:
	Knot.files
	Makefile
	src/common.h
	src/ctl/knotc_main.c
	src/ctl/process.c
	src/dnslib/dnslib.h
	src/dnslib/response.c
	src/dnslib/response.h
	src/dnslib/rrset.h
	src/dnslib/rrsig.c
	src/dnslib/rrsig.h
	src/dnslib/zonedb.c
	src/main.c
	src/other/debug.h
	src/other/log.c
	src/server/name-server.h
	src/server/server.c
	src/server/server.h
	src/tests/dnslib/dnslib_rdata_tests.c
	src/tests/dnslib/dnslib_rrsig_set_tests.c
	src/tests/dnslib_tests.c
	src/tests/server_tests.c
	src/zoneparser/zoneparser.h

All conflicts resolved, but does not compile - need to properly add
  config sources to Makefiles and maybe fix some other problems.

refs #424

refs #424

- Was always setting the node, as the find_nsec3_for_name()
  function always returned some node.

refs #424

refs #586

- was not checking if the node is really a wildcard

refs #425

refs #425

- Added function for cleaning up NSEC3 parameters structure.

refs #425

- Added return value to a lot of functions, propagating the value
  up to ns_answer_request() and returning error response.

- Among other, it deals with run-time collision when hashing
  non-existent QNAME.

Note: Should have been done more effectively and neatly by using
      jumps.

refs #425

refs #425

- Function for adding NSEC3 for wildcard answer.
- Fixed NSEC3 closest encloser proof.
- Functions for adding NSECs and NSEC3s grouped together.

refs #425

refs #425

- Adding NSECs and NSEC3s for NXDOMAIN grouped together.
- Modifier closest encloser proof, to return the closest provable
  encloser.
- Fixed (removed) wrong condition from closest encloser proof.
- Checking duplicates when adding NSEC3.
- Fixed some assertions.

refs #425

closes #572

Closes #574 @20m

- In case of NODATA response, the closest encloser does not have
  to have any data (may be equal to the found node).

- Check if the NSEC3 name was created in find_nsec3_for_name().
- Fix in debug output.
- Printing of hashed name via hex_print().
- Loading NSEC3PARAM prior to adjusting the zone.

refs #425

- Added sample zone file for example.com zone signed with NSEC3.

refs #425

Refs #574 @30m

Conflicts:
	src/dnslib/rdata.c
	src/server/name-server.c
	src/server/server.c
	src/zoneparser/zoneparser.c

+ Removed use of log functions from response and zone-load.

Commit refs #12.