added a few comments to add, addback methods and to the fact that the children are ordered
added some comments about how the menus behave
adding method prependItem and prependLine to menuMorph
adding a minor comment on how the developersMenu is built
replacing popUpAtHand.world with popUpAtHand.world() cause the first one gives error while the second one works
making it so the evaluation menu also includes a hierarchy menu
rebuild and docs