bug#4056: 23.1.50; use shell-command completion for M-x man page names

[email protected]
Newsgroups gmane.emacs.bugs,gmane.emacs.pretest.bugs
Message-ID <[email protected]> 
Gentlemen, as you know when you do M-x man and get the prompt
   Manual entry (default blabla):
there is no TAB completion.

Well as many of the man pages are the same names as shell commands, why
not just use the same completion as shell-command and
shell-command-on-region use?

It's better than nothing, and one can still enter other names too.
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