Dangerous BoundaryLine Optimization

[jdsika]

Since a BoundaryPoint is part of a sequence, only the position attribute has to be set for each instance. All other values will be reused from the previous BoundaryPoint in the sequence or set to default values if there is none or it was never set.

Width and Height are of protobuffer native type "double". Therefore leaving this information away will result in the value 0 when attempting to deserialize. This is a potential source of error.