def advance(self):
        self._tasks[-1][0] += 1
Set the root job of the workflow backed by this job store
dataset/ETHPy150Open byt3bl33d3r/pth-toolkit/lib/python2.7/site-packages/samba/external/subunit/progress_model.py/ProgressModel.advance--crossover with--dataset/ETHPy150Open BD2KGenomics/toil/src/toil/jobStores/abstractJobStore.py/AbstractJobStore.setRootJob