Limnoria CLI commands give inconsistent version output

[jlu5]

Ideally these should be pulled from some central location.

$ supybot --version
Limnoria 2019.10.05 running on Python 3.7.3 (default, Apr  3 2019, 05:39:12) 
[GCC 8.3.0]
$ supybot-adduser --version
supybot 2019.10.05
$ supybot-plugin-create --version
Supybot 2019.10.05
$ supybot-plugin-doc --version
Supybot 2019.10.05
$ supybot-reset-password --version
supybot 2019.10.05
$ supybot-test --version
Supybot 2019.10.05
$ supybot-wizard --version
Supybot 2019.10.05