Version 4.3.1
- fix to leading zeros detection for issue #20
- fix to generation of IPv6 sections from bytes
- adjusted IPAddress.toAddressString() to improve toHostAddress() in resulting IPAddressString
- added toZeroNetwork() to get IP address with network bits zeroed
- added getNetworkMask() and getHostMask() to IPAddressSegmentSeries as requested in issue #27
- multicast fix and fix to toInetAddress()