Add 'rhizome.api.restful.newsince_poll_ms' config option
Improve test framework: better fork functions

Replace forkKillAll with fork_terminate_all

Replace forkWaitAll with fork_wait_all

Add fork_terminate and fork_wait functions

Introduce fork labels '%<alphanumeric>' as arguments to all fork
functions

Treat a forked process exit status 143 (killed with SIGTERM) as a
failure or error -- it happens when a forked process is terminated
using fork_terminate or fork_terminate_all
Improve test framework: shell backtraces

When in a the finalise part of a test (possibly as a result of a
failure or error), make sure that shell backtraces do not list the
test case functions that failed, since they have already been
reported in a backtrace at the point of failure
Fix Rhizome Direct stress test - longer command timeouts

Since a default timeout was added to the execute() primitive
(b1b5a79) the Rhizome Direct test fails.
Finish HTTP /restful/rhizome/newsince/... test case

Uses new test framework fork support