added check for output file existing and option to override#108
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I added an if check to make sure that the output file doesn't already exist. You can use -f or --force to override. If the output file exist and -f or --force are not used, it prints an appropriate error message and exits with fatal(). Updated usage().
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I added an if check to make sure that the output file doesn't already exist. You can use -f or --force to override. If the output file exist and -f or --force are not used, it prints an appropriate error message and exits with fatal(). Updated usage(). Closes #107 Fixes #96