Use f_show_msg() instead of f_dialog_msgbox() where appropriate. The main
difference between these two functions:

	Usage: f_show_msg() $format_string [ $format_args ... ]
	Usage: f_dialog_msgbox() $text [ $hline ]

The former lends itself well to displaying the $msg_* i18n text, prompts,
etc. While the latter is better for text you do not control (error strings
captured as a response from external commands) -- or if you have to control
the hline.
Do not inherit $SYSRC_VERBOSE from operating environment. The concern is
that when a user (such as myself) which has SYSRC_VERBOSE=1 in his/her
~/.bash_profile or such that when they are told to execute a command like:

	hostname `sysrc -n hostname`

NOTE: To activate a recently configured hostname.

If $SYSRC_VERBOSE is set, then POLA is violated because the output of sysrc
is indirectly influenced (making for an inconsistent experience).