GitLab

See #23

- use same server as normal test, but with an additional RPC handler
  that deliberately stalls before responding

- the timeout.sh test case does not work yet

- will use this later to update test scripts to run with sm transport

- move examples to tests
- leave one example in place and simplify it
- make sure everything works with cci
- update README.md to more clearly describe addressing and configuration with CCI

- makes cci/tcp work correctly with margo examples

- yield was in wrong if block, not sure how

- count ULTs in progress pool that are waiting on communication as
  waiters so that we don't busy spin when it isn't necessary
- if a trigger occurs, yield immediately to service ULTs that may have
  been activated as a result
- HG_Progress() is still called too frequently, see TODO note
- outcome: this makes servers significantly faster, but seems to make
  clients a bit slower; optimal performance right now comes from
  building servers with this git commit and building clients without
  it; need to investigate