[PATCH] Emit base objects of a delta chain when the delta is output.

[PATCH] Emit base objects of a delta chain when the delta is output.

Deltas are useless by themselves and when you use them you need to get
to their base objects.  A base object should inherit recency from the
most recent deltified object that is based on it and that is what this
patch teaches git-pack-objects.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>