DESCRIPTION
	Compute mean Canberra distance indicator on top-k sublists.

USAGE
   ./canberra.py <options> <inputfilename> <kvalue>
      OR
   ./canberra.py <options> <inputfilename>
	
ARGUMENTS
   <inputfilename>
      Filename or full path to the input file to be processed.
   <kvalue>
      Single k value for which the Canberra distance is to be calculated.
      If <kvalue> is not specified, values will be generated for all
      values of k from 1 through the length of the first list in the
      input file.
      
OPTIONS
   --inpDelim=<char>
      Delimiter between values in a row; defaults to a comma.
      
   --inpQuote=<char>
      Character enclosing strings if necessary; defaults to
      a double quote.
      
   --inpHeader
      If specified, the first row of the input file is assumed
      to be a header row and is ignored.
  
   --outDelim=<char>
      Delimiter(s) between values in a row in the output file;
      defaults to a comma.

   --outQuote=<char>
      Character(s) enclosing strings in the output; defaults to
      a double quote.

   --outHeader
      If specified, the first row will contain the names of the
      fields.
 
   --outputFile=<filename>
      Name of the output file; defaults to results.txt.

INPUT FILE
   The input file should contain delimited values (defaulting to
   CSV unless options are specified) with an optional header row
   if the correct option is specified on the command line;
   otherwise, the first line is considered to be data.
   
   Each row represents a ranked list, with each item the index
   of the position of the item in the original list.
   For example, if the original list is (55, 66, 44, 22), the
   corresponding row in the input file is (2, 3, 1, 0).

OUTPUT FILE
   The output file will be called results.txt unless the
   --outputFile option is specified. It contains comma-separated
   values (or other delimiters if specified) and may or may not
   contain an header row based on the presence of the appropriate
   option. The values are: k, Distance.