#602098: Defaults updated. Boost is smarter out of the box. Old installs should be careful, various subdirs where chnaged.

#428942 : Faster & more simplerewrite rules; changed cache filename generation. index.html is now _.html among some other changes.

#276495, #185075 by wobbler, Alexander Ufimtsev: Slightly faster .htaccess file & better support for older browsers.

- #153179 Patched for Drupal 5.x compatibility, corrected front page handling, and added expiration time to the Boost page footer (kudos to Alexander I. Grafov, Jacob Peddicord and Justin Miller).
- #103884 Updated the Boost .htaccess file from Drupal 5.x-dev; also added HTTP headers and special-case mod_rewrite rules for correctly handling caching of the front page (kudos to Axel).
- Imported the default .htaccess file from Drupal 5.x-dev.
- Updated credits listing in README.txt.
- Updated INSTALL.txt instructions to reflect Drupal 5.x.

Changelog:
- #153179 Backported corrected front page handling and Boost page footer expiration time from 5.x branch (kudos to Axel).
- #103884 Backported .htaccess improvements from 5.x branch (kudos to Axel).
- Updated credits listing in README.txt.