anchor: love.filesystem.append
  Append data to an existing file.
  success, errormsg = love.filesystem.append( name, data, size )
  name string The name (and path) of the file.
  data string The string data to append to the file.
  size (all) number How many bytes to write.
  success boolean True if the operation was successful, or nil if there was an error.
  errormsg string The error message on failure.
  success, errormsg = love.filesystem.append( name, data, size )
  name string The name (and path) of the file.
  data Data The Data object to append to the file.
  size (all) number How many bytes to write.
  success boolean True if the operation was successful, or nil if there was an error.
  errormsg string The error message on failure.