Remove CGI->param usage from attachment.cgi
attachment.cgi code style
index.cgi: code style, remove CGI usage
Bugzilla::Chart, Bugzilla::Series, chart.cgi: remove CGI usage
Bugzilla::Chart, Bugzilla::Series, chart.cgi: code style
check_access.cgi: remove CGI usage
unsubscribe.cgi: remove CGI usage