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trac3186 added the user_chk hook library which had a couple of
uses of EXPECT_EQ on stl containers. Gtest 1.5 does not like this.

After merging, distcheck revealed a few minor issues with logging
files and unit test data files. These were corrected.

Adds the hooks subdirectory to bind10/dir for storing hooks shared
libraries, and the first such library for DHCP, user_chk.

Mostly minor cosmetics. Added logic to select callouts to
simply return if no subnets are configured.

Conflicts:
	ChangeLog

Conflicts:
	ChangeLog

 - Guide updated
 - Iface::addUnicast() now refeses duplicates
 - addUnicast and clearUnicasts are now commented
 - new unit-tests
 - argument for addActiveIface is const reference again
 -

 - default value is no longer 0.0.0.0, so global value is no longer
   overwritten with subnet-specific values
 - added 2 new unit-tests to check if the value is really set in
   server responses
 - guide updated to explain that
 - fix in Dhcp4ParserTest.nextServerNegative

Added unit test data file, overlooked with prior commit. Also
added missiong include to user_file.cc and took extraneous debug
cout.

Also, clear the output buffer in the Pkt4 and Pkt6 every time when pack()
is called.

Conflicts:
	src/bin/dhcp4/dhcp4_srv.cc
	src/lib/dhcp/libdhcp++.cc

Added doxygen throughout, cleaned up unit tests.  Removed CLIENT_ID type
as it was unnecessary.

 - new negative unit-test for next-server written
 - comments update (capitalized!)
 - indents corrected
 - no more raw pointers
 - ChangeLog added

Interrim checkin. Use of isc::logging has been disabled.  Initializing
the dictionary (MessageInitializer::loadDictionary) cores on Debian. This
has something to do with the libary being opened and closed without calling
load during Kea configuration parsing and the later reopening the library.
See trac#3198.

Replaced couts with isc::log mechanisms in user_chk DHCP hook library.