Code review comment for lp:~lvh/divmod.org/modernize-axiom-packaging

To summarize: the new setup.py doesn't regenerate the Twisted plugin cache post-install the way epsilon.setuphelper does. This doesn't matter for distro packaging or user installs, but represents a regression for system-wide installs as the administrator will need to regenerate the plugin cache manually.

(Also, I don't know of a better way of doing this than the hack present in epsilon.setuphelper)