Server Module: dynamic histogram output for n vars str filter condition
module_server_histograms(
input,
output,
session,
dframe,
selector_inputs,
sel_points
)standard shiny boilerplate
df
reactive vals from above-plot controls,
reactive, provides .dcrkey of selected points
reactive values with input xvar, yvar and actionbutton counter
provides UI buttons for deleting last / entire outlier selection