* When testing multiple clients vs server versions, repeating client
tests is unnecessary. By setting the env variables TASKW_SKIP and
TASKD_SKIP it will now be possible to skip all task (client only) and
taskd (client + server) tests, respectively.
* The new unblocking strategy for subprocesses involves timeouts and
waiting periods. If the timeout is too short (or absent) tests may show
intermittent failure.
* Increasing the timeout may make tests a bit slower but more reliable.
* Processes that blocked waiting for stdin data will now be aborted
after a 1 second timeout.
* As a side-effect any process that takes longer than 1 second to
finish will also be aborted.
* Taskd and Taskw classes for testing are now available
* Testing of server and client can now be performed.
* The newer test wrappers will eventually replace the BaseTest class
