bug#19594: url-ftp: should not be aliased to url-file; url-file: use Tramp

[Eli Zaretskii]

> From: Ivan Shmakov <ivan@siamics.net>
> Date: Thu, 15 Jan 2015 23:47:37 +0000
> 
> >>>>> Glenn Morris <rgm@gnu.org> writes:
> >>>>> Ivan Shmakov wrote:
> 
>  >> As of 88bc8332eb14 (2015-01-07 13:51:41 +0000), url-ftp is
>  >> implemented as an alias to url-file,
> 
>  > I found this confusing.  You mean: "it's always been implemented as an
>  > alias, and this remains true as of last week."  Not: "last week it
>  > was changed to be an alias."
> 
>       Actually, by using present tense, I was intending to say that
>       “it was an alias for the last week’s Git checkout, and I didn’t
>       bother to check when it got changed, or if it was like that
>       right from the start.”

You don't need to mention any commits or dates to convey that.  Just
state the facts.