2677. [func] Changes to key metadata behavior:

2677.	[func]		Changes to key metadata behavior:
			- Keys without "publish" or "active" dates set will
			  no longer be used for smart signing.  However,
			  those dates will be set to "now" by default when
			  a key is created; to generate a key but not use
			  it yet, use dnssec-keygen -G.
			- New "inactive" date (dnssec-keygen/settime -I)
			  sets the time when a key is no longer used for
			  signing but is still published.
			- The "unpublished" date (-U) is deprecated in
			  favor of "deleted" (-D).
			[rt20247]