Output file argument and results in files
Output file argument and results in files

This commit adds the output file argument to place the generated information
into a png for the plot and a txt file for the information to be used by the
simulator.

The txt file has the following format:

Number of central nodes
Positions of central nodes
Number of wireless nodes per central node
Total number of wireless nodes
Positions of wireless nodes

Waseda-Sato-lab/ndn-mobility,Waseda-Sato-lab/ndn-mobility,shinrs20/ndn-mobility,shinrs20/ndn-mobility,Waseda-Sato-lab/ndn-mobility,shinrs20/ndn-mobility,PhilipsIII/ndn-mobility,PhilipsIII/ndn-mobility,samqixin/ndn-mobility,shinrs20/ndn-mobility,samqixin/ndn-mobility,samqixin/ndn-mobility,samqixin/ndn-mobility,PhilipsIII/ndn-mobility,PhilipsIII/ndn-mobility,shinrs20/ndn-mobility,PhilipsIII/ndn-mobility