New user option 'shell-history-file-name'

New user option 'shell-history-file-name'

* doc/emacs/misc.texi (Shell Ring): Explain shell-history-file-name.

* doc/misc/tramp.texi (Inline methods): Be more specific with containers.
(Remote processes): New subsection "Managing remote shell history".
Explain shell-history-file-name.
(Frequently Asked Questions): Add items to Tramp speedup.  Remove
entry about history file.

* etc/NEWS: New user option 'shell-history-file-name'.

* lisp/shell.el (shell-history-file-name): New defcustom.
(shell-mode): Use it.  (Bug#71049)