As reindexation is not scalable delete before reindex and then
delete again just for sure.

Thanks to packet_size and activity_count it is possible to limit to one
small transaction per module.

Catalog can be used, as pervious step catalogs everything.

Also mark 04_ERP5Site_deleteVifibAccounting as not implemented.

A lot of documents are really huge.

Install configurator.

This BT5 can affect running site, so use them in test.

Do what user said and *exactly* what he said.