[Typo3] security: close your directories

[stefano cecere]

after having been hacked in one of my typo3 sites (they got in and 
changed some cached files), i'm giving more than an eyes on security..

i discovered that my (but also some of other websites) typo3temp and 
fileadmin were not "closed" by "Options -Index" or other..

i think the security team could do a little vademecum about the points 
to secure a typo3 sites as much as possible.

hug
stefano