Adds a column to a data.frame containing immunoglobin names re-formatted to match HGNC symbols.
Assumes that Greek symbols have been converted to single letters. Diversity and joining regions are not implemented. The final a/b for e.g. IgG2a is dropped, as the specific modification isn't in protein ontology or HGNC. The lambda light chain will only be matched in HGNC if a gene number is provided.