Added flushcolsend to this

Note that this requires an updated version of sttools from CTAN.

Download the zip archive listed on the page:

http://www.ctan.org/tex-archive/macros/latex/contrib/sttools

and enter that directory and do:

```
latex sttools.ins
```

Then put all the .sty files that produces into the directory:

~/Library/texmf/tex/latex/