[dev] DataTree::sortByAttributes()

[Duck]

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Adds a sortByAttributes method to DataTree_sql. It will reselect the passed 
ids sorted by desiderated attribute_key.  So someone is not forced to select 
all the tree entries and their values, sort it with Horde_Array and then 
slice it to needed part. But we can determinate the IDs needed, before 
creating a number of wasteful objects.

Duck

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