Print only status bars that have been activated #351
                
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This fixes #348 by changing the behaviour of the
progressWithStatusBarsTTYto only print status bars that have beenupdated/reset.
It removes the placeholder label "Starting worker..." and simply doesn't
display status bars that don't have a value yet.
@LawnGnome can you maybe test this too? I tried to replicate different scenarios (cached, uncached, subset cached, more than numProcesses, less than numProcesses) but I'm not sure whether I caught your bug.