[KPhotoAlbum] People and Locations categories not loaded anymore

[Tobias Leupold]

Hi Johannes/Christoph/List,

the problem is that XMLDB::Database::possibleLoadCompressedCategories looks 
for the "new", already updated category names, while the XML still contains 
the "old" ones. Thus, this data is lost.

I attached a patch fixing the issue, at least partially. I introduced a new 
function to XMLDB::Database which tells the file version of the loaded 
database. If it's too old (< 6), the "old" category names are looked up.

I'm pretty sure we still have to handle the case when localized standard 
category names are stored in the database, which are substituted by their 
modern C locale counterpart. This is a bit more tricky ;-)

But at least, I hope this is a good starting point for fixing this issue.

Cheers and good night, Tobias
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