added max/min _no_nil, ie ignore nil's as needed for mat replacement of aggr.max/min with sql semantics
added max/min _no_nil, ie ignore nil's as needed for mat replacement
of aggr.max/min with sql semantics

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