Line ending weirdness

```
What steps will reproduce the problem?
1. Download input files in Cygwin (using Cygwin's python interpreter)

What is the expected output? What do you see instead?
I expect input files with UNIX line endings, I get DOS line endings

What version of the product are you using? On what operating system?
This works properly in real Linux, but something interesting is happening with
Cygwin's python.

I fixed this behaviour by modifying "lib/input_downloader.py", line 101, to use
mode 'w' instead of 'wt'. These should mean the same thing (I think), but at
least for me, 'wt' causes DOS line endings with Cygwin python (2.6.7). AFAIK
changing this to 'w' shouldn't break anything on other platforms.

I also changed line 94 of "lib/data_manager.py" in a similar way, for the sake
of aesthetics.

```

Original issue reported on code.google.com by `sumu...@gmail.com` on 9 Jun 2012 at 9:10