Manpages of python-whisper in Debian stretch-backports

• rrd2whisper(1)
• whisper-create(1)
• whisper-dump(1)
• whisper-fetch(1)
• whisper-fill(1)
• whisper-info(1)
• whisper-merge(1)
• whisper-resize(1)
• whisper-set-aggregation-method(1)
• whisper-update(1)