Issue #1698580: Fatal error: Call to undefined function db_affected_rows() in mp_product_tools.admin.inc.

by hanoii: adding a setting to debug IPN details, properly storing gross and fees on the seller payment tables and grouping masspay settings together

Issue #873348 and #1064990 by hanoii: duplicate key error and only showing file feautres next to file fields on products

All UC Marketplace modules are now 6.x compliant.

Note: Seller's still do not have the ability to "create" attributes.

Support request #806726 by spazfox: Improving the interface for Ubercart attributes and commission in general

Functionality should remain the same

admin module and interface to Marketplace.  This also provides better encapsulation.