[KPhotoAlbum] One more patch -- correct merge and is-sorted logic

[Robert Krawitz]

My final patch of the day, and probably the least controversial.  The
sort code in ImageInfoList.cpp uses <date,filename> as the sort key,
but the isSorted() and merge code only looks at the date.  This
resulted in my index.xml file having lost sort order over time.
-- 
Robert Krawitz                                     <rlk at alum.mit.edu>

***  MIT Engineers   A Proud Tradition   http://mitathletics.com  ***
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--Eric Crampton
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