(comint-read-input-ring): New arg SILENT.

(comint-read-input-ring): New arg SILENT.

(comint-replace-by-expanded-history): New arg SILENT.
(comint-send-input): Pass t as new arg.

(comint-mode-map): Put comint-show-output on C-M-l.

(comint-preinput-scroll-to-bottom): Removed calls to
window-minibuffer-p and 'not-minibuf arg to walk-windows.
Removed mouse-yank-at-click from command list and doc string.
Removed duplicate test for comint-scroll-to-bottom-on-input (scroll).
Removed test for 'this within walk-windows code.

(comint-postoutput-scroll-to-bottom):
Don't select a different buffer permanently.

(comint-prompt-regexp): Fixed documentation.

(comint-replace-by-expanded-history):
Use skip-chars-forward to advance in main loop.