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.

The switch doesn't have an effect yet.

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.

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

The following statement 'buf[i + 1] << 8 + buf[i] & 0xFF' was replaced
with this '(buf[i + 1] << 8) + (buf[i] & 0xFF)' because + operator takes
precedence over << operator.

Applied with trivial whitespace fixes.

If the cmdctl-certfile.pem is older than cmdctl-keyfile.pem for some
reason, make will try to run the rule every time.

DHCP packet pack methods now throw exceptions on error, rather then
returning bool result value.