fix usage/help/man bugs

 - the definition of $PROGRAM as used in $USAGE strings defined in each
   script has been broken for a long time, being simply "lb" when it needs
   to be "lb COMMAND".
 - `config` changed $PROGRAM to "lb config" thus its output was correct in
   this regard unlike everything else, but with the switch to a more
   "intelligent" `Man()` function recently, it means that instead of
   `man lb config`, what was actually run was `man lb config config`,
   which displayed the manpage, then on exiting with `q`, it showed some
   sort of index line todo with a "config" search (no exact manpage
   match?), for which you had to enter `ctrl+c` to get rid of.

this revises things to fix the issues, minimising change by changing
$PROGRAM to "lb COMMAND", with the frontend overriding this.

Gbp-Dch: Ignore

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