Improve slicing of bad models. Improve debug output for slicing.
Improve slicing of bad models. Improve debug output for slicing.

derekhe/CuraEngine,alex1818/CuraEngine,phonyphonecall/CuraEngine,ROBO3D/CuraEngine,be3d/CuraEngine,ROBO3D/CuraEngine,be3d/CuraEngine,foosel/CuraEngine,foosel/CuraEngine,Ultimaker/CuraEngine,Ultimaker/CuraEngine,daid/CuraCutEngine,ROBO3D/CuraEngine,derekhe/CuraEngine,alephobjects/CuraEngine,patrick3coffee/CuraTinyG,phonyphonecall/CuraEngine,alephobjects/CuraEngine,robotustra/curax,mspark93/CuraEngine,jacobdai/CuraEngine-1,pratikshashroff/pcura,markwal/CuraEngine,phonyphonecall/CuraEngine,Skeen/CuraJS-Engine,Skeen/CuraJS-Engine,fxtentacle/CuraEngine,Jwis921/PersonalCuraEngine,totalretribution/CuraEngine,alex1818/CuraEngine,electrocbd/CuraEngine,fxtentacle/CuraEngine,Jwis921/PersonalCuraEngine,markwal/CuraEngine,robotustra/curax,Jwis921/PersonalCuraEngine,mspark93/CuraEngine,uus169/CuraEngine,pratikshashroff/pcura,jacobdai/CuraEngine-1,derekhe/CuraEngine,Intrinsically-Sublime/CuraEngine,mspark93/CuraEngine,alex1818/CuraEngine,fxtentacle/CuraEngine,jacobdai/CuraEngine-1,Intrinsically-Sublime/CuraEngine,electrocbd/CuraEngine,markwal/CuraEngine,robotustra/curax,alephobjects/CuraEngine,totalretribution/CuraEngine,foosel/CuraEngine,uus169/CuraEngine,totalretribution/CuraEngine,pratikshashroff/pcura,Skeen/CuraJS-Engine,patrick3coffee/CuraTinyG,patrick3coffee/CuraTinyG,electrocbd/CuraEngine,uus169/CuraEngine,daid/CuraCutEngine,Intrinsically-Sublime/CuraEngine,be3d/CuraEngine