fix TB when we use merged accounts and drag a contact on another from another account. Fixes #1637 and see also #1596

(widget_height, widget_y_position)

helpers

docs, explaining what this arguments are for

noconfirm_close_muc_rooms is too much customizability exposed to user which only ends up confusing him. fixes #1622

error / not_in_roster / requested / message icons are no more taken in transporticonset, but in jabber iconset. Fixes #1250