moved footer into own file
index.php: use NNTP_HOST instead of assuming that the newsserver also runs the website
added get_group_link function
renamed common.inc to common.inc.php to prevent apache from providing source
header: use NNTP_HOST
article.php: bugfix, replace \t in headers with spaces to allow reference parsing
article: re-use existing NNTP connection by reading the first data into a buffer