src/conf.py: clear hosts4 & make hosts6 ::0

Closes #756
Fixes #935
Merge pull request #944 from Mkaysi/ipv6

src/conf.py: clear hosts4 & make hosts6 ::0
Unix: log shell and call commands at INFO (Closes ProgVal/Limnoria#929)
Unix: update logging
Unix: Update logging again
Merge pull request #947 from GLolol/unix/log-commands

Unix: log shell and call commands at INFO
Seen: insert a witty message when calling seen/any on the bot
Merge remote-tracking branch 'upstream/testing' into lilybot