def startProducing(consumer):
count the number of taxa as found using LCA algorithm
dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/web/iweb.py/IBodyProducer.startProducing--crossover with--dataset/ETHPy150Open CGATOxford/cgat/obsolete/pipeline_metagenomecommunities.py/countLcaTaxa