respect level zero layout from .dgml file
respect level zero layout from .dgml file

* fixes maximum tile calculation for given level
* makes vectorosm theme work again

tucnak/marble,AndreiDuma/marble,David-Gil/marble-dev,tzapzoor/marble,probonopd/marble,Earthwings/marble,AndreiDuma/marble,probonopd/marble,tzapzoor/marble,rku/marble,oberluz/marble,tzapzoor/marble,tucnak/marble,tzapzoor/marble,utkuaydin/marble,quannt24/marble,tucnak/marble,David-Gil/marble-dev,adraghici/marble,quannt24/marble,Earthwings/marble,tucnak/marble,utkuaydin/marble,tucnak/marble,David-Gil/marble-dev,quannt24/marble,tzapzoor/marble,Earthwings/marble,AndreiDuma/marble,David-Gil/marble-dev,probonopd/marble,rku/marble,rku/marble,adraghici/marble,adraghici/marble,David-Gil/marble-dev,oberluz/marble,oberluz/marble,utkuaydin/marble,utkuaydin/marble,Earthwings/marble,probonopd/marble,probonopd/marble,probonopd/marble,adraghici/marble,utkuaydin/marble,quannt24/marble,oberluz/marble,David-Gil/marble-dev,utkuaydin/marble,oberluz/marble,Earthwings/marble,tucnak/marble,quannt24/marble,AndreiDuma/marble,tzapzoor/marble,AndreiDuma/marble,quannt24/marble,rku/marble,oberluz/marble,adraghici/marble,rku/marble,AndreiDuma/marble,probonopd/marble,rku/marble,tucnak/marble,Earthwings/marble,tzapzoor/marble,tzapzoor/marble,adraghici/marble,quannt24/marble