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(io): change the overwrite method when saving with ioAtoms

Romain MANCIAUX requested to merge 501-io-change-the-overwrite-method-when-saving-when-ioatoms into dev

Description

Change the overwrite method of ioAtoms::SWriter. Without this MR, when a file is overwritten, it's deleted then saved. But if the saving failed, the old one is still deleted.

Now, the file is saved with a temporary name, then the old one is deleted and the temporary name is renamed with the real one.

Closes #501 (closed)

How to test it?

Try to save something with VRRender (use jsonz, cpz, or xmlz).

Edited by Caroline TROMPF

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