[KPhotoAlbum] contrib/kpa-merge changes

[Robert Krawitz]

I've made some changes to kpa-merge:

* Fixed a bug that resulted in undefined messages if there are gaps
  in the stack order.

* Added option for compressed output; by default, it uses the
  compression status of the first input file.

* Added option to generate either V7 or V8 output; by default, it
  generates the version of the first intput file.

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

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