add infinite product measure

split Product_Measure into Binary_Product_Measure and Finite_Product_Measure

proved caratheodory_empty_continuous

list comprehension: strip positions where the translation cannot handle them right now;

address serious problem of type inference (introduced in 6f085332c7d3): _type_constraint_ needs type scheme A --> A with proper scope of parameters, otherwise term "(f :: _ => _) :: 'c => 'c" will get type "'a => 'b", for example;

raised various timeouts to accommodate sluggish SML/NJ