index-create when items exists should ask user if he wants an index-update instead
currently if you have already content and run moin index-create the index does not know about any existing items. The result looks like a fresh wiki.
Likly the user wants to call index-update. I think we should check about existing content and request a "Yes" if that really is wanted to have a fresh index.
On my machine if I do later a index-update the newer homepage for example becomes then replaced by the old one.