Replaced data files and added code to build panel data

New panel data include ego network data per each node on top of
activity data; global network data still missing.
Added Tulip file with the Edgeryders main graph and subgraphs (one
subgraph per time period).
Added program Graphbuilder.py that generates both the panel data csv
file and the Tulip file.
Removed old data file
Merge of Alberto into Master branch