Merge pull request #981 from JuliaRobotics/poc/johan_covar

Adding covar to PackedVND

Author: Affie

src/entities/DFGVariable.jl

@@ -120,6 +120,7 @@ Base.@kwdef mutable struct PackedVariableNodeData
     solveInProgress::Int
     solvedCount::Int
     solveKey::Symbol
+    covar::Vector{Float64}
     _version::String = string(_getDFGVersion())
 end