tiff: display "Arstist" and "Software" fields

[ami_stuff]

https://ffmpeg.org/trac/ffmpeg/attachment/ticket/814/tetest.tif

Software is "TVPaint", Artist is "Artist123"

C:\>ffmpeg -i tetest.tif
ffmpeg version N-35966-g1d0ae92, Copyright (c) 2000-2011 the FFmpeg developers
  built on Dec 19 2011 13:01:15 with gcc 4.6.2
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-ru
ntime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libope
ncore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --en
able-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger -
-enable-libspeex --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwben
c --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-
libxvid --enable-zlib
  libavutil    51. 32. 0 / 51. 32. 0
  libavcodec   53. 46. 1 / 53. 46. 1
  libavformat  53. 27. 0 / 53. 27. 0
  libavdevice  53.  4. 0 / 53.  4. 0
  libavfilter   2. 53. 0 /  2. 53. 0
  libswscale    2.  1. 0 /  2.  1. 0
  libpostproc  51.  2. 0 / 51.  2. 0
Input #0, image2, from 'tetest.tif':
  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: tiff, rgb24, 1024x768, 25 tbr, 25 tbn, 25 tbc
At least one output file must be specified

[ami_stuff]

TAG_Artist (0x13b)
TAG_Software (0x131)

​http://www.accusoft.com/resourcecenter/documentation/ImagXpress/activex/AccusoftImagXpress10~ImagXpress~TagNumber.html

[Elon Musk]

This have been implemented: ffprobe -show_frames should show relevant TAGs.
If you want frame metadata to be displayed in some other way create new bug report.