add type VelVector

Author: ufechner7

src/VortexStepMethod.jl

@@ -32,6 +32,7 @@ const MVec3    = MVector{3, Float64}
 Position vector, either a `MVec3` or a `Vector` for use in function signatures.
 """
 const PosVector=Union{MVec3, Vector}
+const VelVector=Union{MVec3, Vector}
 
 # Include core functionality
 include("wing_geometry.jl")