createdb: Scan sharing channel should be added as "public".

Signed-off-by: Martin Stone <martin@d7415.co.uk>
!broadcast: Remove unnecessary import.

Signed-off-by: Martin Stone <martin@d7415.co.uk>
IMAPPush: Remove line breaks before parsing the message body.

Signed-off-by: Martin Stone <martin@d7415.co.uk>
!defcall, !broadcast: Robocop hates spaces, so make !broadcast accept a substitute and make !defcall use it where needed.

Signed-off-by: Martin Stone <martin@d7415.co.uk>