Gittrac #6203:  Documented that DAG halting (and condor_hold) are not propagated to sub-DAGs.
Gittrac #6203:  Documented that DAG halting (and condor_hold) are not
propagated to sub-DAGs.

htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor