Sort txf list

I noticed that the Tax Form and TXF code list was oddly jumbled.  I found it very difficult to determine all the codes which I could use and kept feeling like there was a lot of duplication.

First I made sure that all the TXF codes for any given Tax Form were together. Then I sorted them by the TXF codes.

The Help item for each Tax Form had been duplicated so that was removed. Also I found when I sorted them that one Home Sale item had been entirely duplicated but no other duplicates were found.

If this sorting is OK, then I can do the same for the other instance of this file (in the `de` directory).