MP3 file renamer v1.0 by A'rpi/ESP-team      idea: DrN0
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1. Configure it:  edit mp3rename.c, comment/delete parts you don't need
   (it's well commented, in hungarian :))
   
2. Compile & Install:
   gcc mp3rename.c -o mp3rename
   mv mp3rename /usr/local/bin/mp3rename

3. Select Commands/Menu file edit in mc, and copy this to there:
--------------------------------------------------
+ t t
R       Rename tagged MP3 files
	set %u;
	while [ -n "$1" ]; do
	  mp3rename "$1" || echo tag "$1" >>$MC_CONTROL_FILE
	  shift
	done

+ ! t t
R       Rename MP3 file
	mp3rename "./%0f"
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4. Restart mc, and enjoy mp3rename :)  (select mp3 files and press F2/R)