Create a "global" reference set for a given clade (e.g., one species from each order or family)

[egreyavis]

Assuming we are going with families, this would require:

• Getting all families for a given clade (e.g., vertebrates)
• Searching Refseq for mitogenomes in each family and choosing one
• For families without Refseq mitogenomes, search regular nucleotide database