Fix restart frame number when output_t0 is True

[rjleveque]

Fix src/Nd/restrt.f so that frame number is not advanced if output_t0 is True

In this case it re-writes the last frame from the original calculation
when restarting, and it should reuse that frame number.  For historical
reasons the frame number is called matlabu, stored in amr_module.f90

[mjberger]

it's not correct. I was about to comment.

Can you regress? — Marsha

On Sep 14, 2023, at 11:18 AM, Kyle Mandli @.***> wrote:

Merged #281 https://github.com/clawpack/amrclaw/pull/281 into master.

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[mandli]

Yes, but what was not correct? Does it not work?

[mjberger]

gives wrong frame number in the output_t0 case false.

— Marsha

On Sep 14, 2023, at 11:30 AM, Kyle Mandli @.***> wrote:

Yes but was not correct? Does it not work?

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[mandli]

Does amr2 need to be modified?

[mjberger]

that's how I did it, but I"m trying to fix it without that using only restrt.

I have a meeting. I"ll have to do it this afternoon.

— Marsha

On Sep 14, 2023, at 11:36 AM, Kyle Mandli @.***> wrote:

Does amr2 need to be modified?

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[mandli]

Reverting this for the time being along with the equivalent GeoClaw PR then.