Replace some uses of obsolete argument of display-completion-list

Replace some uses of obsolete argument of display-completion-list

* lisp/minibuffer.el (completion-hilit-commonality):
Make `base-size' argument optional.  Short-cut if `prefix-len' is 0.

* lisp/comint.el (comint-dynamic-list-completions): Doc fix.

* lisp/comint.el (comint-dynamic-list-completions):
* lisp/filecache.el (file-cache-minibuffer-complete):
* lisp/tempo.el (tempo-display-completions):
* lisp/eshell/em-hist.el (eshell-list-history):
Replace use of obsolete argument of display-completion-list.

* lisp/tempo.el: Use utf-8 for author name.