- IOAddress::increase() simplified
 - getLeasesCount renamed to getPoolCapacity
 - removed several intermediate variables

 - getRelayInfo() implemented, relay_ is now protected
 - setRelay => setRelayInfo
 - Option::Universe is passed as const reference
 - Further clarified white_list_ field in Subnet.h

 - Copyright years updated
 - Minor corrections in BINDX Guide
 - dhcp4.spec relay structure description updated.
 - new unit-test for DHCPv4 client classification added
 - new unit-test for DHCPv6 client classification added
 - fixed Doxygen errors
 - comments for CfgMgr::getSubnet{4,6} updated

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

 - lease_type_ renamed to pool_type_
 - exception message clarified
 - prefix lengths comment updated
 - couple EXPECT_NO_THROWs added to subnet unit-tests

reviewed by jelte via jabber.

Changes some log message descriptions and some
function arguments and some output.

The index object used to get the range of searched options was local
to the function and when returned from it search results were destroyed
along with index (Mac, Solaris only). The alternative solution to
copy results to another container was not picked due to performance
considerations.