org-timestamp-up/down broken in tip

[Max Mikhanosha <max@openchat.com>]

With latest git I can only press S-up or S-down on the time part of
the timestamp once, after changing the time it moves point to the
closing bracket, and doing another S-up or S-down changes the date
part instead of time.

Example: with point on the "05" at the timestamp [2011-07-21 Thu
19:05] doing Shift-Up results in time correctly changed to 19:10, but
point moves to the closing bracket. Next time you press S-Up it
changes date, not time.

Reverting following commit fixes the problem for me:

commit fd0f8e10d1d3a339da9460d6c71283e85897c455
Author: Nicolas Goaziou <n.goaziou@gmail.com>
Date:   Thu Jul 21 11:48:35 2011 +0200

    Fix bug with TODO states changes modifying scheduling of next headline
    
    * lisp/org.el (org-timestamp-change): some locales don't use the same
      length for date abbreviations. Set a marker at origin in case length
      of new timestamp is different.