Initial thoughts on a TODO.022.

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+Nick's initial priorities for Tor 0.2.2:
+
+NOTE 1: I'm not looking at fiddly little stuff from TODO.021 yet.  We
+        can do a step where we triage the nice-to-have issues.
+
+NOTE 2: It's easy to list stuff like this with no time estimates and
+        no target dates.  I think we should pick a target date for
+        0.2.2, figure out how long the stuff we want will take, and
+        triage accordingly, or vice versa.
+
+- Design
+  - Begin design work for UDP transition; identify areas where we need to
+    make changes or instrument stuff early.
+
+- Performance, mostly protocol-neutral.
+  - Work with Libevent 2.0's bufferevent interface
+    - Identify any performance stuff we need to push back into
+      libevent to make it as fast as we want.
+
+  - Revise how we do bandwidth limiting and round-robining between
+    circuits on a connection.
+
+  - Revise how we do bandwidth limiting and round-robining between
+    connections.
+
+  - Better flow-control to avoid filling buffers on routers.
+
+  - Split AES across cores if possible.
+  - Split SSL across cores (reach; may require Libevent 2.1).
+
+  - Figure out good ways to instrument Tor internals so we can tell
+    how well our bandwidth and flow-control stuff is actually working.
+
+- Features
+  - Proposals to implement:
+    - 146: reflect long-term stability
+    - 147: Stop using v2 directories to generate v3 votes.
+
+  - Proposals to improve and implement
+    - 158: microdescriptors
+
+  - Proposals to improve and implement if not broken
+    - IPv6 support.  (Parts of 117, but figure out how to handle DNS
+      requests.)
+    - 140: Directory diffs
+    - 149: learn info from netinfo cells.
+    - 134: handle authority fragmentation (Needs more analysis)
+
+- Deprecations
+  - Make .exit safe, or make it off-by-default.
+