* add cutoff for low expression genes in topN selection
* remove debugging printfs
* change cli param name for diffexp cutoff
* change CLI param name
* second try at diffexp - using lfc sort with pval cutoff
* use lfc cutoff
* update comments to match code; cap p-value adjustment to max of 1
* lint
* explain diffexp in readme
* add link
* add diffexp-lfc-cutoff to test config
* update test to match revised diffexp spec
* fix latent bug in GET arg handling that was breaking tests
* lint
* comment cleanup
* fix variance overestimation so it is symmetric
* lint
* new diffexp REST API spec
* new diffexp REST API; faster diffexp and dataframe slicing
* first draft of fast diffexp
* convert variance calculation to two-pass method
* lint
* update front-end use of API
* fix typo in spec
* disable content compression
* catch index filter format errors
* clean up of dead code
* resolve PR review comments