rework getLayerSecondWalls() to make sure it doesn't completely remove isles with less than 0.8mm radius (= offset_from_outlines = 2*nozzle_size)
rework getLayerSecondWalls() to make sure it doesn't completely remove isles with less than 0.8mm radius (= offset_from_outlines = 2*nozzle_size)

alephobjects/CuraEngine,pratikshashroff/pcura,markwal/CuraEngine,ROBO3D/CuraEngine,pratikshashroff/pcura,Ultimaker/CuraEngine,totalretribution/CuraEngine,totalretribution/CuraEngine,alephobjects/CuraEngine,pratikshashroff/pcura,ROBO3D/CuraEngine,markwal/CuraEngine,ROBO3D/CuraEngine,totalretribution/CuraEngine,alephobjects/CuraEngine,Ultimaker/CuraEngine,markwal/CuraEngine