Blender Git Loki

Fix for possible memory leak on creation of a vector using Vector.Range.
It was possible to allocate an array of size<2 which would then raise an error on vector creation without freeing.

Fix to ensure the behaviour of Vector.Range was the same as for builtin range() function. When specifying 3 arguments, the step argument wasn't being used to correctly calculate the vector size.

Minor formatting edits for error messages.