BAThistogram: set correct sorted and key bit in trivial cases (BATcount(bn)<2)
BAThistogram: set correct sorted and key bit in trivial cases (BATcount(bn)<2)

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb