Fix for old database - converting from cPickle

When converting the database from old format
object are still save as they where, so
string that where cPickle.dumps were drugged on.
This creates a bug when trying to decrypt them.
Hence reapplying the changes from previous commit
16dd14a0b09726fda4801a042493833624367103

cPickle will stay a bit longer ...
Remove duplicate old db warning