Refs #89

Refs #89

- Changed a name of a free function
- Other small changes.

Refs #89

- Ready for testing now
- Few fixes
- Added some missing frees, debug messages

Refs #89

Refs #89

 + cleanup in lists.c.

 Refs #89

 - Refs #89

refs #82

fixes #82

Refs #89

Conflicts:
	src/common/fdset_epoll.c

- Needs a diff-review, untested

Treated as hostname otherwise.

- Nighlty tests would sometimes crash, when zones were not bootstrapper properly.

Also some log messages cleanup.

Also CID#1047013

 - Still not compilable
 - Will need a check - 'rdata' are removed from 'changes' altogether, be sure that it is not needed somewhere (probably not though)

- This is needed to fix a buggy DDNS rollback
- Added mempooled lists instead of dynamic arrays - much less code, no duplications
- Partial changes in usage, but still not compilable

refs #71, #65

The reasons are discussed in #71.
Namely:
- transfers are self-paced, TCP clients are divided among threads
- due to the nature of DNS, most of the connections should be active
- if not, it is probably an attack, long idling connections are disconnected
- even then the performance degradation is not so severe

fixes #71