* Only the length aggfiles should be of the form (min, max)
* Add mfdb_survey_index_total
* Import functions should allow removal of data
* Add institutes for Baltic
* Add Deep-water rose shrimp to species list
* Add CNR-IAMC to institute list
* Remove need for specifying fleetname in data for gadget_fleet_component, it makes no sense
* mfdb_step_interval must be integer, it's not going to work otherwise
* Add support for fleet files
* Fix bootstrapping when multiple group columns are used
* Notice if a query function is given a non-list params
* Weighted stddev should ignore NULL rows
* Weighted mean should ignore NULL rows
