Channel Operations May Fail Depending on `DeallocOp()` Placement

[hunhoffe]

This is part of my effort to write examples using channels in a variety of ways (#648).

I've been having some issues with getting worker-to-worker (core-to-core within a herd) data movement with channels to work. I managed to make it work, but the program is extremely brittle.

For instance, moving a deallocation sooner caused the program to work, where if I had my deallocations at the end, the output was all zeroes.

My code is found here: #697
The commit to move the dealloc ops that fixed the example is: 17162b1

[hunhoffe]

I did a redesign here, but it still does not work:
#697
The output data is all zeroes. However, the redesign definitely fixed a bug or two in the original design.

[hunhoffe]

I fixed the design, but I think the previous design should have been valid.