Rewrite bootstrap script for clarity

Hello,

I rewrote the install script for some mysterious reason. As short and uninteresting as it was, I suppose something irked me about it and I rewrote it. The changes are all cosmetic, except for the `stream.isatty()` check, which hardly matters. 

Feel free to ignore this :)

Regards,
Georgi
This type of comment line has infected my Python lately. I work with the single file, 5000+ line, variety of Perl and Python scripts and usually the only way to add a measure of structure and sanity to them is through creative commenting. I guess a few years ago I would have considered this monstrous myself ...