[dev] DataTree::getByAttributes() with sort parameters

[Duck]

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The patch contains the previews supplied extension to getFirst()/getLast() to 
return the min/max tree object trough an attributable query and adds an 
possibility to override the sorting order of the getByAttributes() results. 
If the optional parameters are passed, buildAttributeQuery()
will add another left join to sort the results like getSortedTree() does.

Duck

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