bug#18428: Bug#760861: bug#18428: coreutils binary breaks coreutils documentation

[Paul Eggert]

Pádraig Brady wrote:
> So we'll stick with the longer form
> (which is likely to be cut n pasted in any case)

While this sounds like a win, I still like the idea of renaming the 
troublesome info node, as there is a lot of advice out there to use the 
old forms for 'info' and it's probably better to support that advice, at 
least for a while, than to make it immediately stop working.

I noticed other problems that are at least somewhat related to the 
recent coreutils multi-binary executable changes, and fixed some of 
these problems with the attached patches.  (I ran out of energy before 
fixing the rest.  :-)  Patch 2 renames the troublesome node.

Come to think of it, how about removing the 'coreutils' command 
entirely?  Why should users invoke 'coreutils' directly?  We could move 
it to libexec and remove it from the documentation.

0001-doc-mention-which-commands-are-optional.patch
Description: Text document

0002-doc-rename-coreutils-invocation-to-Multi-call-invoca.patch
Description: Text document

0003-maint-prefer-return-status-to-exit-status-in-main.patch
Description: Text document

0004-maint-avoid-file-scope-names-of-the-form-_-a-z.patch
Description: Text document