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it effectively makes this branch with trac517 (which has been merged to
master since then).  it will help merge this branch to master.

also resolved trivial conflicts in src/lib/datasrc/tests/rbtree_unittest.cc.

This reverts commit 1ab958cd.

also removed an unused initialization as a piggybacked cleanup.
okayed on jabber, behavior confirmed, too.

okayed on jabber.

bash isn't available on all platforms by default.  we should be conservative.

Conflicts:
	configure.ac

Conflicts:
	src/lib/asiolink/asiolink.cc

In particular:
* Use Use asiolink abstractions instead of Boost::asio directly
* Add cross-section checks (answer/question v authority)
* Extended description of bailiwick
* Methods added to isc::dns::Message and asiolink::IOAddress

Actually, it turns out to be much simpler than originally thought on top
of the RBTreeNodeChain extensions made on this branch so far.

 - new methods were added to RBTreeNodeChain
 - RBTreeNodeChain::clear() was also added, mainly for the convenience of tests

In the latest usage we don't need to copy RBTreeNodeChain objects.
It would be safer to disable copy unless/until we see need for it.

 - construct the backend rbtree with the 'empty okay' mode
 - return NXRRSET if the found node is empty