[Koha] Export patrons

Koha 3.0 has a tool for importing patron data, but no tool for exporting patron data. This would come in very handy for making batch edits to large or large-ish numbers of patrons: Export all data, edit as needed, then import. (I believe the Import tool only allows for over-writing the entire patron record, rather than just any fields that happen to be non-null.) If I have things right here, is there a canned report that will effectively export all the data? Is there any danger of de-linking circ data with the corresponding patron record? Thank you, Cab Vinton, Director Sanbornton Public Library Sanbornton, NH