Bug reported by Guido Vranken.

Issue #19286: Adding test demonstrating the failure when a directory is found in the package_data globs.

Initial patch by Bruno Piguet.

This is implemented as if a useful .netrc file could exist without passwords,
which is possible in the general case; but in fact our netrc implementation
does not support it.  Fixing that issue will be an enhancement.

Changeset c39f42f46a05 left a dangling head on 3.1.

Issue #17980: Fix possible abuse of ssl.match_hostname() for denial of service using certificates with many wildcards (CVE-2013-2099).

codecs.open().

broke backwards compatibility.

such as was shipped with Centos 5 and Mac OS X 10.4.