logging settings * document helpful log format when dealing with MT issues * on Win32, use a logrotate equivalent so that logs get a bit lighter (requires updates logilab.common)

0.0.2: 2.3.0
0.0.3: 2.4.0
# missing 0.0.4 entry, that's alright
0.1.0: 2.6.0
0.1.2: 2.10.0