[#30192] Disallow directory listings in default config

This is a continuation of [JoomlaCode item 30192](http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=30192) and modifies the distributed `htaccess.txt` and `web.config.txt` files to disallow directory listings by default.
Can you do that like suggested by Nicholas in the tracker:
````
Options +FollowSymlinks
Options -Indexes
````
It makes it easier to disable a single command and the `All` isn't needed anyway.