[KPhotoAlbum] Updated database merge/maintenance script

[Robert Krawitz]

I've added a new feature to the script (remove unused category
members) and fixed some bugs (in particular, not attempting to use
index value 0, which is invalid).

-- 
Robert Krawitz                                     <rlk at alum.mit.edu>

***  MIT Engineers   A Proud Tradition   http://mitathletics.com  ***
Member of the League for Programming Freedom  --  http://ProgFree.org
Project lead for Gutenprint   --    http://gimp-print.sourceforge.net

"Linux doesn't dictate how I work, I dictate how Linux works."
--Eric Crampton
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