Deprecate insecure download strategies
Undocument UnsafeSubersionDownloadStrategy
gnutls 3.3.9

“I’ve just [released gnutls 3.3.9](http://article.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/7728). This is a bug-fix release on the stable branch. With this release the 3.3.x branch becomes the stable branch.”

Revisions to a whole host of related things, partly from Jack’s previous GnuTLS revision bump, and partly from local testing.
finch: add 2.10.9_2 bottle.
gnutls: update 3.3.9 bottle.
hamsterdb: add 2.1.8_2 bottle.
kbtin: add 1.0.14_2 bottle.
libvirt: update 1.2.9_1 bottle.
mailutils: add 2.2_1 bottle.
nettle: update 3.0 bottle.
pianobar: update 2014.09.28_1 bottle.
pidgin: update 2.10.9_2 bottle.
profanity: update 0.4.4_1 bottle.
qemu: update 2.1.2_1 bottle.
taskd: add 1.0.0_2 bottle.
tiger-vnc: add 1.3.1_2 bottle.
vpnc: add 0.5.3r512_3 bottle.
weechat: update 1.0.1_1 bottle.