Ensure c-hadron parent barcode is decorated
Apply full FTAG truth labelling to truth c-hadrons, in order to have the full decay chain info available.
The ftagTruthParentBarcode will now be decorated to c-hadrons, allowing us to connect them with their parent b-hadrons.
get_parent_hadron now only returns weakly decaying hadrons, which was necessary to make sure we reach the b when feeding in a c.
This noe meand that fragmentation tracks from HF hadronisation will no longer have a valid parent barcode (as they have no weakly decaying parent).
This is probably an improvement but worth noting.
Edited by Samuel Van Stroud