-  add labels support [-m/-M]

-  comment, clean up, optimize code
-  drop RHEL 6 / Python 2.6 support around RHEL 6 EOL (ca. 2020)
-  drop RHEL 7 / Python 2.x support around RHEL 7 EOL (ca. 2024)

-  includedir config file support (?)
-  copy directive conf file support (?)
-  generalized zabbix_interval (write to target in batches) (?)

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In use cmd line options:
0123456789AaBbCcDdEeFfGgHhIiJjKkLlNnOoPpQqRrSsTtUuVvWwXxYyZz

Reserved:
Mm

Available:
