prevent duplicate slave notications caused by different ipv6 address formatting
aviod address truncation in doNotifications
add toMasks and clear to NetmaskGroup class and use it
add only-notify option
fixes #454
closes #778
partial fix #949
add also-notify option
fixes #949
catch ComboClass exceptions in communicator
Merge pull request #1182 from mind04/ipv6

Ipv6 master improvements and new also-notify/only-notify options. Closes #778, closes #454.