Added minimum and maximum of a set operators min and max.
Changed syntax of objectives to << minimize ... >> and << maximize ... >>. The old syntax << min ... >> and << max ... >> still works but it is now deprecated.
Changed precedence of if/then/else so that nested expressions do not need to be in parens. See issue #73.
minandmax.<< minimize ... >>and<< maximize ... >>. The old syntax<< min ... >>and<< max ... >>still works but it is now deprecated.if/then/elseso that nested expressions do not need to be in parens. See issue #73.-v.