Code review comment for lp://staging/~meitis/widelands/bug861761

A short comment on your todo: If you have the sleep command after produce (and thus after consume), this would cause the productivity of buildings with missing wares to drop very fast. This is some unwanted behavior I fixed some time ago (https://code.launchpad.net/~wl-zocker/widelands/bug571796/+merge/225387)