eipp: let apt make a plan, not make stuff plane

eipp: let apt make a plan, not make stuff plane

Julian noticed on IRC that I fall victim to a lovely false friend by
calling referring to a 'planer' all the time even through these are
machines to e.g. remove splinters from woodwork ("make stuff plane").
The term I meant is written in german in this way (= with a single n)
but in english there are two, aka: 'planner'.

As that is unreleased code switching all instances without any
transitional provisions. Also the reason why its skipped in changelog.

Thanks: Julian Andres Klode
Gbp-Dch: Ignore