Ensure that we send the specified signal to the entire process group of each member of the pid provided to us. This ensures that any children spawned by our children also see the signal

cmr=v1.7.5:reviewer=jsquyres
Revert r31091 - the functionality didn't disappear, but moved into the MPI layer :-(
Remove the job_control_forwarding logic as we want *any* signal to go to all members of the process group

Refs #4404
Removing ml include from bcol_ptpcoll.h. 
It is not really required.