Move feature subset (variant, all_genes, etc) creations to a property of BaseData
rename plot_feature_violins --> plot_violins
Add xticks to violinplots
add renamed_to_feature_ids and maybe_get_renamed so you can specify a common gene name and get all the expression/splcing/editing features associated with it
move violinplot call to BaseData, so splicing has Splicing.plot_event as a specific implementation
Add outliers to violinplot
Add outliers to violinplots, abstract out actual violniplot making
Fix subset_pooled_and_single to handle sample_ids=None
Pass DataModel to reducer for access to _violinplot, change violinplot calls to use the DataModel's