[m-rev.] additional mdb aliases

[Julien Fischer]

Hi Peter,

On Wed, 3 Jul 2019, Peter Wang wrote:

> The recent thread on m-users reminded me of the mdb aliases that I've
> collected since I started using Mercury. Would it make sense for some of
> them to be added to the default configuration? I'm sure everyone has
> their own aliases but I expect many similarities.
>
> One that might be controversial is 'd' for down, which clashes with 'd'
> for dump. I've always used 'st' or 'bt' (compatible with gdb), but some
> people might be used to 'd'.

Personally, I use down a lot more than dump, so I would prefer it
to have the shorter alias.

I don't any objection to adding these aliases.  I suggest also
adding "exit" as an alias for "quit".

Julien.