Doesn't save XYZ: Checkpoint information

[mattehicks]

When loading a state that contains XYZ plot, the parameters are empty. Resulting in a failed run when no params are entered.
The params I'm using are a list of 'Checkpoint' entries.

Thanks.

[ilian6806]

This is gonna be much harder, because all params have different value types. Marking it as an enhancement for now.

[mattehicks]

Perhaps just taking the first generation would be sufficient? Up to you, good work regardless.