The previous implementation of Freestyle edge/face marks was refactored based on suggestions from the latest code review by Campbell. The new implementation relies on mesh CustomData to store edge/face marks, instead of introducing extra flags in the core Mesh and BMesh data structures. The CustomData-based implementation will allow further additions of new edge/face attributes because of the independence from Mesh/BMesh. This revision is work in progress, mainly intended to address the review comments and ask for further code review in view of the trunk merger in the upcoming 2.67 release.