2.4.0

-add zabbix-agent template and configuration file export,
-add new types of connections in "connections" plugin,
-add modification of interval for metric gather,
-add a message in mamonsu log to notify if plugin was disabled in the configuration file,
-add new plugin: archive_command,
-fix oldest transaction time instead of oldest query time and exclude excess processes from a query in "oldest" plugin,
-fix typos in "connections" plugin.