2023-05-20: moved agent plugin from ~/local/share/check_mk/agents/plugins/linux
                                 to ~/local/share/check_mk/agents/plugins
            renamed bakery plugin from squid to squid.py
            moved to ~/local/lib/check_mk/gui/plugins/wato
            renamed from check_squid.py to squid.py
            changed client_reqps to client_requests
            changed server_reqps to server_requests
            changed cpu_time to cpu_usage
2023-05-21: rewrite for CMK 2.1.x
2023-05-22: agent plugin: fixed missing "<" in section name
2023-09-21: bakery plugin: moved file to ~/local/lib/check_mk/base/cee/plugins/bakery (THX to Andreas Doehler)
                           fix crash if port not configured in wato
2023-12-02: fixed crash on empty section or missing value
            added swap section
            added file descriptors section                           
            bakery plugin: dded IP-Address option