[dev] limit for DataThree::getByAttributes()

[Duck]

patch adds limit from/to parameters to DataThree::getByAttributes() by calling 
DB::modifyLimitQuery(). So we can retrieve the desiderated amount of data 
from DataThree backend.

While making the patch I discovered that DataThree (CVS from 28.8) retrieves 
the data twice.  

For example: 
datatree_id, datatree_name
21 	adf
21 	adf
22 	adfadfad
22 	adfadfad

The problem is later hidden because we store the data in an index array and 
the double values are overwritten.  

Duck
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