* zone timers are frozen before zonedb reconfigure
* zone timers are rescheduled after zonedb is reconfigured & published

refs #209
fixes #202

Conflicts:
	src/knot/nameserver/name-server.c
	src/knot/nameserver/update.c
	src/knot/zone/zonedb.c

* removed redundant attributes
* removed unused parameter occurences
* moved related functions to appropriate files
* evsched has now context (server)
* zone does not point to server
* zone event planning is still in the zone loading and requires server #209

libknot: move debug API into knots

This simple change just move API for debugging from libknot into shared code static library.

closes #204

Merge zone_t and zonedata_t

Merges public and private API for zones, resulting in new private API.

Just get rid of the leaks. Useless alike other dbg_ messages.

Old API required to create duplicate fake zone with switched contents.

Before signing a zone for a first time, NSEC3 tree weight is 0.

separately

This patch disconnects contents from the old zone, so it may introduce
a short period where it answers SERVFAIL. Ownership of the zone/contents
must be resolved as part of the #209.

skipped

Conflicts:
	src/knot/conf/cf-parse.y
	src/knot/nameserver/update.c

Dnstests Valgrind Check

Extra 32B is allowed for reachable, as dlopen() may cause this,
but it shouldn't be treated as an error.

Conf Zone Name

Nsupdate Update Fixed

fixes #207