sequences now integrated into the kernel

[William la Forge]

Sequences are now integrated into the kernel. Some things have been sped up and other things are just easier. Consider the following code taken from ContainerComponent:

    def deleteAll {

      val it = iterator

      while (it.hasNext) {

        val name = it.next

        delete(name)

      }

    }

This could normally would not work, as the delete removes one of the items being iterated over. But iterator is implemented over a sequence rather than directly over the container, and it works just fine!

Next up: Enhance the container API to support b-trees. This needs to be done before Naji starts implementing KernelBTreeContainer and BTreeContainer.

Bill