- Comments updated
 - getRawHWAddr renamed to getHWAddrVector and moved to Lease class
 - HWAddr object is now copied in copy ctor and = operator

 - clarified that returned offset refers to last successfully parsed option
 - unpackOptions6() now returns proper offset if vendor-option is truncated

 - duplicate warning removed.
 - unpackVendorOptions4 now returns proper offset when option is truncated

 - (offset - 4) explained better
 - Modified Dhcpv6Srv::unpackOptions()
 - setHWAddrMember() mac_addr renamed (this time for real)
 - Commented out unused variables
 - RelayInfo now uses DEFAULT_ADDRESS6 in ctor
 - LibDHCP::unpackOptions6 and callback now used uniformly
 - Clarified that ERO is Echo Request Option (RFC4994)
 - unpackOptions4 in libdhcp and Dhcp4Srv no longer throw when
   truncated option is received.

 - Pkt4, Pkt6 classes now have descriptions
 - Many descriptions updated in Pkt class
 - Pkt::addOption() moved back to Pkt (from Pkt6)
 - DEFAULT_ADDRESS{,6} are now in private namespace.
 - copyright updated