Users of Python client pyethapp should upgrade to the latest version immediately

KenK

This affects users of the alpha client Pyethereum - users of approved Frontier command line interfaces geth and eth are unaffected.

Users affected: Users of Python client “pyethapp”

Impact: Issue will eventually lead pyethapp clients to fail to reach consensus with the go and c++ clients

Issue description: Double-counting non-unique suicides when computing refunds, contrary to the protocol specification. See link to test.

Workaround: n/a, see fix below

Fix: Users should ensure, that they are using v 0.9.73 of the ethereum library or onwards, available from 2015.08.12. Users of pyethapp should reinstall

> pip install pyethapp --force-reinstall.