Windows: Netlogo modules must be in same dir as model

So unfortunately this means we have to duplicate
data-export-modular.nls into both directories where
it is used.

This version also allows empty lists for the run-series
categories.
IS NetLogo model: Ramp-starter.v3

Initial commit of simpler ramp model as delivered from Bob Tinker
add data-export features to Ramp-starter
add Ramp-starter to list of IS NetLogo Models