pcf process IPv6 in their standard notation again

For windows compatibility, replace_colons_from_filenames.sh is available. Keep in mind that this
script does not change the content of the files so gnuplot files cannot be directly regenerated.
Added possibility of being notified on stdout about detected clock skew matches
pcf banner updated
Print pcf banner only in verbose mode
ComputerInfo cleaning: attributes listed at one place as a result some were made private

TODO:
What is the purpose of firstPacketReceived?
Why is the pointer to the parentList stored (as void pointer)?
Detected frequency message is displayed only in verbose state

The message also shows the address
ComputerInfo.Notify() only when a new block was actually processed

Previously to many notifications were sent
capture.cc: Print capture starting time only in verbose mode
Merge branch 'bfrankova-merge' into change_skew_notify