Clarify terminology standalone backend vs. single-user mode

Peter Eisentraut <peter_e@gmx.net>

Commit: 7dfd5cd21c0091e467b16b31a10e20bbedd0a836
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2013-06-21T03:03:18Z
Releases: 9.4.0
Clarify terminology standalone backend vs. single-user mode

Most of the documentation uses "single-user mode", so use that in the
code as well.  Adjust the documentation to match the new error message
wording.  Also add a documentation index entry for "single-user mode".

Based-on-patch-by: Jeff Janes <jeff.janes@gmail.com>

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