Re: make createlang match docs

> I was going to add this to TODO:
>
> Change 'createlang [langname] dbname' to 'createlang langname [dbname]'
>
> However, when I started to look at the createlang script, I saw:
>
> if [ "$list" != "t" ]
> then langname="$1"
> if [ "$2" ]
> then
> shift
> dbname="$1"
> fi
> else dbname="$1"
> fi
>
> which said that dbname was already behaving as optional, even though
> there was code to handle a missing langname.
>
> Rather than change the script to make langname optional, I have fixed
> the script to work the way everyone wants it to work, namely dbname is
> now optional. I grabbed the dbname default code from createdb.

OK, turns out droplang has the same problem; default are documented but
do not work. Fixed to have dbname optional, just like createlang.

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