/*


      This is a small program to manipulate contours.

      Currently it is possible to add (+) or substract (-)
      two contours.

      Leif Laaksonen CSC 1996

      Compile:

      cc -O2 -o contman  contman.c

      Usage:

      ./contman -iinputfile1.plt+inputfile2.plt -ooutputfile.plt
      or
      ./contman -iinputfile1.plt-inputfile2.plt -ooutputfile.plt

*/