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Disable building resolver by default

Conflicts:
	configure.ac

Detect old versions of boost and suggest either disabling shared memory
for them or upgrading.

... as we only use it in an automake condition.

This has caused issues in the past (see other error messages for example),
and escaping with \ doesn't seem to help in those cases.

So don't disable it by default.

Don't build the resolver and its libraries (lib/resolve and lib/libnsas)
in case the --enable-experimental-resolver is not set.

This reverts commit 2092528a.

It should not go to master yet. Reverting until it is through
review.

The switch doesn't have an effect yet.

Tell more details about what the problem is.

The bug is in offset pointer, not in the red-black tree.

Conflicts:
	ChangeLog
	src/bin/dhcp6/dhcp6_srv.cc

D2UpdateMgr::checkFinishedTransaction was issuing an invalid read
when attempting to prefix increment an iterator used in an std::map erase
call.  This was flagged by valgrind and also core dumped under FreeBSD10.

 - unknown message log added
 - comments fixed

Adds initial implementation of D2UpdateMgr class to
src/bin/d2.

D2UpdateMgr members were rescoped to be more appropriate
and unit tests adjusted accordingly. Other minor changes.

After trying to persuade automake to disable optimisations selectively
on the library or object file and trying desperate ways like
https://lists.gnu.org/archive/html/automake/2006-09/msg00038.html,
it produced a different kind of segfault with that version of boost.
It's likely that part of boost was not matured in that version yet, so
require new boost for the shared memory support.

With old version of boost and some versions of gcc, the RBTree
implementation is not stable with optimisations turned on. Detect the
old boost if we use gcc (no idea how to trigger it with the whole
machinery of the crashing test, so testing against the version).

Fail in that case now, we'll do something more drastic in following
commits.

Reverse IP address methods in D2UpdateMgr were declared static. Other
cosmetic changes.

Added initial implemenation of D2UpdateMgr class to src/bin/d2.

Adds initial implementation of D2QueueMgr class to DHCP_DDNS.
This class is manages the queue of inbound DHCP_DDNS requests.

Changes were largely cosmetic.

Conflicts:
	doc/Doxyfile
	doc/devel/mainpage.dox