spam filter / graph update

1) managed to prevent mutt from asking for confirmation before passing a mail to bogofilter + now it deletes the message automatically

macro index S "unset wait_key\n\ bogofilter -Ns;date +%y%m%d >>~/public_html/stats/spam_s\n\ set wait_key\n\ "

2) improved the generated graph: now there are two ones: filtered and unfiltered

3) added an avarage number to both graph

darcs repo still available here