SQL persistence documentation updates
Update user messages.

Why are the error messages so primitive? They're not in sync
with the old README file; how could the README be more modern?
Spruce up the list request.
Fix atom printing
Update the SQL documentation
Work around a frequent user error
Beautify the command prompts slightly.
wrap long lines
Work around some command request craziness
Add missing carriage returns
A tiny bit more shell prompt fixup.
minor cleanup.
Merge pull request #425 from linas/master

Assorted cleanup, documentation