propagated chnages from MonetDB_4-4-0 branch to main trunk
propagated chnages from MonetDB_4-4-0 branch to main trunk

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