read comments

> implemented comments-reading (very, very rudementry), read only,
write is going to follow
> if costum template does not have one file (e.g. comment.html) the one
from the default template is used
> added template for comments
> added global lorbeer css
> changed way of output (site is collected in one variable and
outputted at once instead of every function echo'ing)
> so many changed files caused by changing permissions