Traverse a DList and insert / remove in place?

[Armando]

Wonderful, that works like a treat, thank you so much! For those 
who wonder, inserting after works too:
```d
   for (auto range = list[]; !range.empty;)
     {
         if (range.back.id == 8)
             list.insertAfter(range, MyType(88));
         range.popBack();
     }

```
which will give
```
MyType(0)
MyType(1)
MyType(2)
MyType(4)
MyType(5)
MyType(66)
MyType(6)
MyType(7)
MyType(8)
MyType(88)
MyType(9)
```