Wait and block for the results to be generated for the pending sleigh job.
If the job has completed, then waitSleigh returns immediately with
the generated results.
Usage
"waitSleigh"(.Object)
Arguments
.Object
a sleighPending class object
Details
The sleighPending class object, .Object, is usually obtained
from the return value of non-blocking eachElem or non-blocking
eachWorker.