- replaced gofmt expression formatting algorithm with

rsc's algorithm
- applied gofmt -w misc src
- partial CL (last chunk)

R=rsc, r
http://go/go-review/1024041

src/pkg/math/fmod.go

@@ -29,7 +29,7 @@ func Fmod(x, y float64) float64 {
 	for r >= y {
 		rfr, rexp := Frexp(r);
 		if rfr < yfr {
-			rexp = rexp-1
+			rexp = rexp - 1
 		}
 		r = r - Ldexp(y, rexp-yexp);
 	}