The files in this directory are certificates required primarily by
Authorize.Net for credit card processing. See their developer blog on
[production certificate upgrades](http://community.developer.authorize.net/t5/The-Authorize-Net-Developer-Blog/Production-Certificate-Upgrades-begin-May-27-2015/ba-p/50430)
and our [issue 26436](https://www.xtuple.org/xtincident/view/bugs/26436).
There may be some redundancy here between our code, Qt, and various
operating systems.  That seems unavoidable given the timing of
upgrades of various components.
