add auto_restore option to disable auto loading

[Ir1d]

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What does this PR do?

Fixes #368 (issue).

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I think no one is actually working on this, so i brought a pr.
As an hot fix, no breaking change is included.
Please get this solved asap. I'm fucked up by this auto loading..

[Ir1d]

@Borda @neggert @williamFalcon @ethanwharris please take a look

[williamFalcon]

i was thinking that we would just get rid of it altogether?

[Ir1d]

+1 for get rid of them all.
But it seems would be a huge update in docs, tests etc. I see the examples are associated with this feature. Also, someone might be still depending on this feature. So for now, I'm introducing this option as an intermediate option.

[Borda]

I do not have any strong opinion about it, I understand the point resume from lat automatically but it can be dangerous if you have a bit mess in your logging folder so resuming from a specific checkpoint is better...

[Ir1d]

anyway, I've edit my local pl to remove the restore function.. Feel free to close this PR if you'd like to remove the loading at once.

it can be dangerous if you have a bit mess in your logging folder so resuming from a specific checkpoint is better...

Indeed, the logging behavior is hidden and not clearly logged, and it is called inside model.fit, which overwrites any initialization and my ckpt loading

[williamFalcon]

yeah, let's remove it altogether