Add option to suppress user Y/N prompt for makenemo clean

Context

Branches impacted: main

Analysis

a952db1d uncommented the user "Y/N" prompt for makenemo clean. This causes cleaning to fail in batch mode with "cleaning cancelled", e.g. in SETTE clean_config when using sette.sh -c.

Fix

Add a -y option to automatically answer "y" to this prompt. It should not be the default (as in sette.sh) to avoid accidental cleaning.

Edited Dec 08, 2023 by Daley Calvert

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