Generate data using the ancestral allele and not 3D7

[Chiyun-Lee]

This would also fix DHPS haplotypes:

" Swap DHPS derived / ancestral allele at G437A - 3D7 DHPS 437 is listed as G437A, but should be A437G. The 3D7 reference has the G allele here, hence why the code gives G437A, but G is actually the derived, drug resistant allele, whereas the ancestral allele is A. "