I realized that the notice cookie was being sent right when calling the notice method, while in Moebooru the cookie is actually sent on the next request.
added position to advertisements. with it, one can choose to either show an horizontal add only at top, bottom or both.
removed can_see_ads check from AdvertisementsHelper::print_advertisement() because it's already checked before calling it.
horizontal-bottom ads in post#index are centered.
removed "Reset hit count" checkbox in ads#edit.
Width and Height in ads form are now "number" fields.
Width and Height must now be set also for "Html" ads.
made ads#show a little nicer.
ads#create and ads#update redirect to ads#index if success.
some other related changes.
made ad#show a little nicer
