each command's date of birth without looking in OONEWS

[Dan Jacobson <jidanni@dman.ddts.net>]

K> There is dired-jump (from dired-x, I think).

oops.  so there it was all along.  But how long?
PROPOSAL
Want a command that will show just when another command joined emacs,
without one having to pour thru OONEWS files.
For instance, C-x C-j is bound to dired-jump, but for just how long
has this been the case?  Well, such dates could come up with C-h f
output, or maybe another specialized command could be made.  A mere
C-? C-? C-x C-j would tell me
C-x C-j has been bound to dired-jump since 3 Sep 1998
dired-jump has existed since 2 Sep 1997
it was implemented by RMS
upon the urging of Chip Fiasco
with the assistance of Chuck Burger
after an idea posted by Clark Kvnt 

OK, it is easy enough to see the source dired-x.el however the dates
of birth of each individual command have been thrown away, and all be
know is the date list at the top of the file...

Anyways, maybe put the date of birth of each function into its
docstring. I mean many man pages have "a xxxx command existed in
Version 7 UNIX", "Example of <xxx> in HTML 2.0, 3.2..."
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