New issue by ndalliard on mblaze repository

https://github.com/leahneukirchen/mblaze/issues/206

Description:
I would suggest `EDITOR="${VISUAL:-${EDITOR:-vi}}"` in [mcom](https://github.com/leahneukirchen/mblaze/blob/e8981b723d35c530ef217140c965287ecd0e9031/mcom#L496) instead of only `${EDITOR:-vi}`.

On OpenBSD in `man ksh` it says under `EDITOR`:

````
                Note: traditionally, EDITOR was used to specify the name of
                an (old-style) line editor, such as ed(1), and VISUAL was
                used to specify a (new-style) screen editor, such as vi(1).
                Hence if VISUAL is set, it overrides EDITOR.
````

Can create a pull request if appreciated. Thanks for the great work!