If public key is unknown message gets temporarly accpted now. Avoids get
calls during the reply handling causing timeout exceptions.
Merge remote-tracking branch 'origin/master'
Merge branch 'pk-update'
cleanup

Signed-off-by: Nico Rutishauser <nr@hotmail.ch>
#51 + put chunks in separate steps; support rollback of putting chunks

Signed-off-by: Nico Rutishauser <nr@hotmail.ch>