Add tests for forceBalance option

[shaunlebron]

Each test case has inand out blocks, but I think we need a out-forceBalance block to make sure forceBalance behavior doesn't regress.

Also, I'm not sure why this is currently reproducing bad output (missing close-parens) in 3.0.0:

(def} [1 2 3
++++++
 4 5 6

(def [1 2 3
       4 5 6

[shaunlebron]

I also need to add extra tests for partialResult.

I think I'll hide new out-<option> blocks in <!-- --> comments.

[oakmac]

I think I'll hide new out- blocks in <!-- --> comments.

Pushing the limits of the custom annotation syntax.