How to get rid of added URLs when printing a Bootstrap-themed page?
Found it: it wasn't jQuery, but CSS3.  Down in bootstrap.css, we find:

@media print {
  ...
  a[href]:after {
    content: " (" attr(href) ")";
  }
  ...
}


Overriding the style with content:none handles the situation fine.  There are some similar :after clauses in there doing similar things, but this is working for now.