lisa.stats: Do not use unit column for aggregation
lisa.stats: Do not use unit column for aggregation

The columns to aggregate can be auto-detected. Make sure the unit column
is not taken as part of it, as it will confuse some methods that expect
the unit to not be part of the aggregation column.

ARM-software/lisa,credp/lisa,credp/lisa,ARM-software/lisa,credp/lisa,ARM-software/lisa,ARM-software/lisa,credp/lisa