provide a --no-update option to GetComponents

GetComponents currently has a --update option to force updates and will query if one wants to update if no option are given and there are existing checkouts. There is however no programmatic way to force no updates which would be useful in scripts or tutorials in Jupyter where the query is not always possible (in jupyter by default the query cannot be answered since user cannot type, so GetComponents contains a specific kludge for this case).

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