Eeschema: fix an old bug: sometimes E hotkey (and some other' hot keys)  was editing a previously selected item, not the item under the mouse cursor
Templates: remove useless backup files

Here is a first cut at the 40pin booster pack template. I made 2
versions, BoosterPack40, which has the optional J5 connector and is
2"x1.7" and BoosterPack40_min, which is 2"x1.35" and leaves the
switches accessible.