printf.Verbose: Formats and prints object if above threshold
Description
  Formats and prints object if above threshold.
  The output is indented according to *enter()/*exit()
  calls.
Usage
"printf"(this, fmtstr, ..., level=this$defaultLevel, timestamp=this$.timestamp)
Arguments
fmtstr
A character string specify the printf format string. level
A numeric value to be compared to the threshold. timestamp
A logical indicating if output should start with a
    timestamp, or not. See Also
  For more information see Verbose.