bug#26986: 26.0.50; Unsafe recovery should be off by default in batch mode

[Eli Zaretskii]

> From: Philipp Stephani <p.stephani2@gmail.com>
> Date: Sat, 27 May 2017 12:06:52 +0000
> Cc: 26986@debbugs.gnu.org
> 
>  OK, but the batch mode is not used only for debugging or testing.
>  Perhaps we should change the values in these two cases.
> 
> That would be a good start. However, I still think these should be off in 
> batch mode by default; batch mode is
> very unlikely to be used for circumstances where they could be useful. 

Batch mode is frequently used to test or present problems that happen
in interactive sessions, so I'd like to avoid making the batch mode
too different from the rest.