FileReduction .h5 saving isn't compatible with every output function

[Louhokseson]

OutputQuantumSubsystem returns a datatype Vector{Matrix{something}}. Each matrix represents the columns of electron wave functions which are computed from TD Schrödinger equation.

Current FileReduction doesn't have the ability to save this output into a .h5 output file.

Potential solution 1: change the output data in a compatible type of data so that it can be stored

Solution 2: Update the FileReduction function to increase the compatibility

[Alexsp32]

This is a general issue with Vector{Matrix} type quantities, including DynamicsVariables. See #345 #333 as well.