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Remove change log entry as it isn't needed

Update eval log description in user guide.

Update per the review comments except for the logging
stuff which will be done next.

This fixes issues reported by the coverity scans recently.

 - getters/setters implemented in Cfg4o6.
 - extra space removed.

(besides, this type of file-static definition is dangerious - it can lead to
static initialization fiasco).

with resolving conflict (the HEAD version wasn't complete)
	src/lib/dhcp/tests/pkt4o6_unittest.cc

(and perhaps the double-underscore version is non-standard)