Zen Cart 1.3.9f Released

Another small update release to the Zen Cart series, this one addresses a number of Bug Fixes.

If you're upgrading from v1.3.9a or b or c or d or e, you can simply update the files listed in the various "Changelog for v1.3.9b" and "c" and "d" and "e" in the /docs/ folder of the download zip. (There are no database changes between v1.3.9a-b-c-d-e-f.)

If you're upgrading from v1.3.8a or older versions, you need to follow the FULL upgrade instructions, also in your /docs/ folder.