[consulting] scaling sites with restricted downloads

[Moshe Weitzman]

> There was talk sometime back on a mini-bootstrap that would be usable for
> things like images, Ajax, ...etc. by  reducing the overhead of the bootstrap
> for these type of calls.

we already have mini bootstrap, maxi bootstrap, and a few levels in between. 
see drupal_bootstrap(). the issue is that all modules must be loaded (i.e. 
full bootstrap) in order to determine authorization.