Fills quant sqlite with precursor quant from:
        features - generator of xml features from openms

def create_precursor_quant_lookup(quantdb, mzmlfn_feats, quanttype,
                                  rttol, mztol, mztoltype):
    """Fills quant sqlite with precursor quant from:
        features - generator of xml features from openms
    """
    featparsermap = {'kronik': kronik_featparser,
                     'openms': openms_featparser,
                     }
    features = []
    mzmlmap = quantdb.get_mzmlfile_map()
    for specfn, feat_element in mzmlfn_feats:
        feat = featparsermap[quanttype](feat_element)
        features.append((mzmlmap[specfn], feat['rt'], feat['mz'],
                         feat['charge'], feat['intensity'])
                        )
        if len(features) == DB_STORE_CHUNK:
            quantdb.store_ms1_quants(features)
            features = []
    quantdb.store_ms1_quants(features)
    quantdb.index_precursor_quants()
    align_quants_psms(quantdb, rttol, mztol, mztoltype)