[development] Files directory on installation usability fix not quite usable. ; )

[Angela Byron]

Here's a usability report from one of our GHOP students: 
http://ijailbreak.com/drupal.html (please post feedback to 
http://drupal.org/node/197219#comment-652618). He interviews three test 
subjects: his mom, his brother, and his Dad.

In it, he points out that all three of his test subjects got totally 
blocked at this error and needed him to step in and fix it in order for 
them to continue. This is the *second* page of the installation. If we 
are losing people before they even get Drupal installed, we are screwed.

I realize the argument against including a files directory by default is 
that Mac OS does this insane behaviour of overwriting the contents of 
"files" with another directory of the same name, so there's a chance of 
completely blowing away someone's files directory. So as far as I can 
see, we're left with a couple of options:

- Revert the existing behaviour, which at least allows mere mortals to 
get Drupal installed, even if it's a somewhat annoying thing to deal 
with later.
- Include the blank files directory anyway, and trust that people are 
either reading upgrade instructions, or not running production websites 
off of a Mac OSX desktop/laptop.

Thoughts?

-Angie