Add '-v' (increase verbosity) option, used to display msg dates and timezones
... when using the the 'l' (list messages) command (to view post date/time).
Use '-vv' or '-v -v' to see timezones of messages.

The -v option is now also applicable to the 'v' (view) messages command (now
redundant with the 'V' command).

Features as requested by Nelgin as part of issue #786.

Removed day-of-week from date/times displayed. We don't need that level of
user-friendliness with this tool.
However, we are also displaying 12h/am/pm times. Some sysops probably would
prefer 24hour time, so that should be considered at some point.