Updates since 4.1:
4.2.0 - added models for tracking U3Actions (like invoice download). Supports new functionality for downloading all modified invoices from OpenInvoice since the last time it ran, for Data Warehouses.
-Fix to StaticMap handling in getADE().
-Fix to do_maintenance command to properly handle Service objects that don't have a do_maintenance() function.
-[BETA] added support for AP Payment processing for clients using Welland Export or Bolo Connect
-Modified SMB connection mechanism to better handle and record error conditions.
-Added the optional ability to archive invoice XML files after processing.
-Modified JPMC document to allow conditionally setting the document_type value.