bug#20446: tramp ate my bash history

[Glenn Morris]

Michael Albinus wrote:

> I have changed again the default value. Tested with remote bash, ksh and
> zsh; seems to cause no harm. Could you please recheck?

Thanks, make check no longer clobbers my .bash_history.

(Minor point - would this file be better as .emacs.d/tramp_history?
Or maybe it's a pain to check that .emacs.d exists?)