* lang/python/examples/howto/local-sign-group.py: locally sign every
key in a group line except one's own keys. Intended to address the
sort of thing one might see on lists like PGPNET or other closed
groups amongst activists, journalists, etc. where everyone encrypts
to all recipients, but may not sign everyone's keys publicly..
Signed-off-by: Ben McGinnes <ben@adversary.org>
