Not all arrays were being fully flattened
Not all arrays were being fully flattened

If a variable has the format y=[[2.]] for each update, then the saver contains
[[[2.]], [[3.]], ...] and after flattening it was a 2D colmn array. This
is a bug, and I changed it to flatten that 2D column array to a 1D
array.

rlabbe/filterpy,rlabbe/filterpy