Copied human allele aliases from IMGT

[iskandr]

• Added https://www.ebi.ac.uk/cgi-bin/ipd/imgt/hla/deleted.cgi to allele_aliases.yaml
• Got rid of null aliases (e.g. 1*CHANGDA: ~) and replaced with known_alleles.yaml of alleles that don't follow any format but should be preserved as written.
• Added only_class1 and only_class2 options to parse()
• Exposed Parser verbose option to function API
• Renamed map_allele_aliases to use_allele_aliases
• Moved application of transform_parse_candidates to final step in parsing pipeline before filtering of candidates in Parser.parse
• Apply transform_parse_candidates to alleles contained in Haplotype, Serotype, and Class2Pair.
• Set use_allele_aliases to False by default