Consider noun-verb naming, commands namespace

[roberth]

run* was kind of unnecessary and contributors are not inclined to use it. Maybe it somewhat useful to distinguish effects from functions that generate bash commands, like ssh. This could would be better achieved with a namespace, e.g. commands.ssh.

Another potential issue is the the verb is not always fixed. Behavior may vary by branch, which is represented either by runIf(?: #65 ) or by a parameter like runNixOps action = "switch". In the latter case, for which runIf is not suitable, what should the effect function be called? nixops is kind of taken by the package name, but that's not an issue when users call it as effects.nixops { action = _some logic_; }