mergerepo issue

Hi,

In merge.py, _sort_func deletes one package if both have the same name, even they have different versions.  This caused a bug for me, and I have to add comparison of versions to make my code work.

My use case is:  I have a yum repo on S3, every time I have a newer version of the product, I would run createrepo on this version, and merge repomd with the one on S3.  Because they have the same name, the default mergerepo doesn't work.

Please tell me whether I did it the right way.

Thanks
JJ  
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