IritArrDemo User Manual 
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- In order to run IritArrDemo, unzip the file IritArrDemo.zip into a new directory.

- The directory contains two executables IritArrDemo.exe and wntgdrvs.exe (an Irit display
  program) and some data files. If the environment variable IRIT_DISPLAY is set in your system (and if you have
  already run IRIT it should be set), then it will use the program set in IRIT_DISPLAY, otherwise
  it will use the wntgdrvs.exe program from the zipped directory.

- Run "IritArrDemo.exe TestCrvs.itd" - the program reads the Irit data file, constructs
  the corresponding arrangement and prints info on the resulting arrangement. It then colors
  the arrangement edges in different colors. To display the point location capabilities of
  the arrangement it prompts the user and asks whether a location query of the Origin point
  is wanted and if so it displays the resulting located face.

- Run "IritArrDemo.exe" and when prompted enter the number of random curves you want as input.
  The rest is as above.