Log Message:
Update tor to 0.2.0.19-alpha.
Changes in version 0.2.0.19-alpha - 2008-02-09
  Tor 0.2.0.19-alpha makes more progress towards normalizing Tor's TLS
  handshake, makes path selection for relays more secure and IP address
  guessing more robust, and generally fixes a lot of bugs in preparation
  for calling the 0.2.0 branch stable.
Changes in version 0.2.0.18-alpha - 2008-01-25
  Tor 0.2.0.18-alpha adds a sixth v3 directory authority run by CCC,
  fixes a big memory leak in 0.2.0.17-alpha, and adds new config options
  that can warn or reject connections to ports generally associated with
  vulnerable-plaintext protocols.
Changes in version 0.2.0.17-alpha - 2008-01-17
  Tor 0.2.0.17-alpha makes the tarball build cleanly again (whoops).
Changes in version 0.2.0.16-alpha - 2008-01-17
  Tor 0.2.0.16-alpha adds a fifth v3 directory authority run by Karsten
  Loesing, and generally cleans up a lot of features and minor bugs.