Read in man page from STDIN, not a temp file

Documenation:
  '-h, --help' is now rendered using 'man' reading in from STDIN.  This
  is accomplished by converting output from a variable -> temp file to
  reading in directory from a heredoc which is sent to /dev/stdin.

__aucdtect():
  Fix broken title output of spectrogram.  This is a remnant of the
  the old way of using $i as the filename, rather than the positional
  parameters, $1..$n.

  Also fixed spectrogram's progess display output.

Minor tweaks to comments as well.