(top-level): Move provide statement to end.
(pcmpl-unix-group-file, pcmpl-unix-passwd-file): Remove leading `*' from doc-string. Allow to be nil. (pcmpl-ssh-known-hosts-file): Convert comment into expanded doc-string. Allow to be nil. Add :version. (pcmpl-ssh-hosts): Move definition before use. Handle lines without hostnames, and multiple hostnames per line.
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