Refactor the GenotypeCarriersReporter to support reporting multiple alleles

[rjzupkoii]

The GenotypeCarriersReporter was originally written to report on carriers of 580Y or 561H. However, with the expansion of artemisinin resistant genotypes, it may be necessary to update the reporter to perform an arbitrary count of carriers. This will likely require the addition of a new database table along additional entries in the YAML configuration files.