Enable -d=newInst as default.

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• Flip the default value for the newInst debug flag.
• Add -d=-newInst to all test cases using the old frontend.

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This is something of a "let's see what happens" thing. I wrote a script that added -d=-newInst to all test cases that didn't already use the flag, but it's probably not perfect and might need some manual intervention.

But the thought is to allow us to switch the NF on by default without having to update all the testcases at the same time, and instead make it possible to update the testcases in batches at our own pace.

And of course there might be other issues that needs to be solved first, like making sure it doesn't mess up the scripting interface.

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I forgot to actually commit the change that enabled the flag the first time...

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I'm closing this and opening a new PR that only changes the testsuite and not turning the NF by default, since more work is needed before that can be done.