update to handle new api format and stuff

1. updated public metagenome dump
2. updated api url
3. updated widgets that use metagenome resource query to get lists of metagenomes
    -  metagenome and metagenome_statistics resources were merged
4. switched wizard to use matrix instead of abundaceprofile (they were merged also)
5. updated annotation piecharts / barcharts to have a min cutoff for abundances that produce no view