Add two lists element by element
# S3 method for objlist
+(out1, out2)List of numerics or matrices
List with the same structure as out1 (there will be no warning when mismatching)
List of length of out1.
If out1 has names, out2 is assumed to share these names. Each element of the list out1
is inspected. If it has a names attributed, it is used to do a matching between out1 and out2.
The same holds for the attributed dimnames. In all other cases, the "+" operator is applied
the corresponding elements of out1 and out2 as they are.