- eth0 => ethX in several examples
 - added @todo in Dhcp6Srv, getMAC() is now static
 - added @todo in CfgMACSource

 - Moved MAC operations to a new CfgMACSource class
 - Moved macros to HWaddr class
 - Added several unit-tests for MAC sources
 - MAC extraction code moved to separate function in Dhcpv6Srv

 - clarified that order in mac-sources is important
 - tweaked all examples to use eth9 rather than more common eth0

One of the reservations is within the pool of dynamically allocated
addresses. The example demonstrates that the server will not allocate
this address dynamically and will only assign it to the client that
has a reservation for it.