[mv] Added [userdb load]

["Christopher Thompson" <ct@arborinternet.com>]

******    message to minivend-users from "Christopher Thompson" <ct@arborinternet.com>     ******

I needed to reload the current users userdb values because I was using the
same var names in a form (I know, you say "why are you doing that!").
Anyway, I added a load option to the userdb tag and thought I'd post it.
The code below goes in mvend/lib/Vend/UserDB.pm in the sub userdb after
the elsif for save. Thought is would be handy.

	elsif($function eq 'load') {
		$user = new Vend::UserDB %options;
		unless (defined $user) {
			$Vend::Session->{failure} = "Unable to access user database.";
			return undef;
		}
		$status = $user->get_values();
	}

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