Patched versions available on github

[Vangelis forthnet]

On Mon Apr 4 22:11:11 BST 2011, dinkypumpkin dinkypumpkin at gmail.com wrote:

>Versions available:

>1. Only the patch from Jon Davies to add Radio 4 Extra to channels
>2. All the above, plus patch from Shevek to make default remuxing of AAC 
>audio into M4A container
>3. All the above, plus patch from me to add --aactomp3 command-line option 
>to force transcoding AAC audio to MP3
>4. All the above

 Big Thanks for those, but forgive me for being thick-minded:
If version 3 contains a) Jon Davies' patch, b)  Shevek's patch and c) "your" 
patch, how is version 4 different to version 3 (and vice versa)?