-  comment, clean up, optimize code

-  -Q/-B/-Y/-R/-W to override per-metric settings

-  opt to support pmdumptext -X like output (or shorten inst names if needed) [-g]
-  opt to output in short format (see pmdumptext -F/-G / pmNumberStr) [-m/-M]
-  handle too wide unit display (like count/s when width is 5) if needed

-  per-metric precision support (?)
-  (re)add runtime directive to config file (?)
-  generalized zabbix_interval (limit writes to target) (?)

-----

In use / reserved cmd line options:
AaBbCcDdEeFfGgHhIiKkLlOoPpQqRrSsTtUuVvWwXxYyZz

Tentatively planned:
Mm

Available:
JjNn
