Returns a dict map with old to new header fields

def switch_psm_to_peptable_fields(oldheader):
    """Returns a dict map with old to new header fields"""
    return {old: new for old, new in zip([mzidtsvdata.HEADER_PEPTIDE,
                                          mzidtsvdata.HEADER_PROTEIN,
                                          mzidtsvdata.HEADER_PEPTIDE_Q,
                                          mzidtsvdata.HEADER_PEPTIDE_PEP],
                                         [peptabledata.HEADER_PEPTIDE,
                                          peptabledata.HEADER_PROTEINS,
                                          peptabledata.HEADER_QVAL,
                                          peptabledata.HEADER_PEP])}