x - close parts should be joined by testing gaps between them...
  x - Tests and ensures that nb_err is greater than 1.
  x - First time it is launched, checks right and left limits of chunks.
  x - Make a estimation time of end. 
  x - Test if dd_rescue is the good version : the one that makes a summary 
 even in maxerr mode (partly done...)
  x - less but clearer output if possible (ansi color ?)
  x - Real handling of options... for max_err min_bs max_bs, the log_file 
 source... etc ...
  x - Much cleaner code.
  x - Better internal Map, with dd_rescued byte, error bytes, clean bytes...