Weka helper uses a stream
delegate some work of the MatrixSqlGenerator to the AnnotatedSpanExtractor
create extra function for the arff header export
added ResultSetTypedIterator for iterating over ResultSets (and mapping the rows with a Spring RowMapper)
allow to iterate over matches, not only spans and output ARFF header
handle first match correctly
use streaming method also in the service
handle the case that a span is matched several times in each match
more efficient copy
show error message when weka exporter has a timeout
Merge branch 'matrixstream'