added 'show_gaps' support to the 'net' graph
added 'show_gaps' support to the 'serv' graph
added 'show_gaps' support to the 'mail' graph
added 'show_gaps' support to the 'port' graph
added 'show_gaps' support to the 'user' graph
added 'show_gaps' support to the 'ftp' graph
added 'show_gaps' support to the 'apache' graph
added 'show_gaps' support to the 'nginx' graph
added 'show_gaps' support to the 'lighttpd' graph
added 'show_gaps' support to the 'mysql' graph