Add a -hbond_bb_per_residue_energy flag for hbond decomposition
By default Rosetta includes bb hbonds in the total score, but not
for per-residue scoring. There's a setting which turns this on,
but it was previously accessible only computationally. This flag
allows commandline manipulation of the setting, for people who look
at the table at the end of their PDBs and go "Wait a momement! Why
doesn't residue 23 have a non-zero hydrogen bonding energy?"
No test changes expected - defaults should be the same.