Tor alpha brings major changes

Some very exciting features in the Tor alpha. Besides supporting Rust components and efficient SHA-3 use, the long awaited netflow padding has made a grand entrance:

Major features (traffic analysis resistance):
- Connections between clients and relays now send a padding cell in
each direction every 1.5 to 9.5 seconds (tunable via consensus
parameters). This padding will not resist specialized
eavesdroppers, but it should be enough to make many ISPs’ routine
network flow logging less useful in traffic analysis against
Tor users.

  Padding is negotiated using Tor's link protocol, so both relays
  and clients must upgrade for this to take effect. Clients may
  still send padding despite the relay's version by setting
  ConnectionPadding 1 in torrc, and may disable padding by setting
  ConnectionPadding 0 in torrc. Padding may be minimized for mobile
  users with the torrc option ReducedConnectionPadding. Implements
  Proposal 251 and Section 2 of Proposal 254; closes ticket 16861.
- Relays will publish 24 hour totals of padding and non-padding cell
  counts to their extra-info descriptors, unless PaddingStatistics 0
  is set in torrc. These 24 hour totals are also rounded to
  multiples of 10000.