infer_class2_pairing for non-human class II alleles

[timodonnell]

mhcgnomes.parse("HLA-DRB1*03:08", infer_class2_pairing=True) gives a Class2Pair, as expected.

However, mhcgnomes.parse("Patr-DRB1*03:08", infer_class2_pairing=True) gives an Allele

[timodonnell]

These are the cases where I am encountering this:

• BoLA-DRB3*001:01
• BoLA-DRB3*002:01
• BoLA-DRB3*011:01
• BoLA-DRB3*012:01
• BoLA-DRB3*027:03
• H2-EB*b
• HLA-DQA1*01:01
• HLA-DQA1*01:02
• HLA-DQA1*03:01
• HLA-DQA1*05:01
• Mamu-DRB*w2:01
• Mamu-DRB1*03:03
• Mamu-DRB1*03:06
• Mamu-DRB1*03:08
• Mamu-DRB1*04:06
• Patr-DRB1*03:08