Reset CLI_TOOLKIT_HELP_CMD after help/man creation.

So that --help and help command in interactive console (REPL) sessions
work as expected.
Make rc caching optional with a rc.cache boolean.

Default is false, ie, rc files are loaded for every parse() through the
middleware processing.
0.8.165
Allow automatic conflict detection to be disabled.

For interactive programs that have not configured a stash a property
conflict would be detected attempting to re-parse within the same
program instance.

Interactive REPL style programs that wish to re-parse through the same
instance may now do so by setting the *conflict* configuration property
to *false*.
0.8.166
Update ecommand handling.

Allow for disabling and for the *required* property to be a callback
function.
0.8.167
Implement cmd style short help document.

Output similar to npm(1).
0.8.168
Remove help2man style gnu document headings.

Closes #82, short style summary removed from gnu document, use cmd
style for short command listings.
0.8.169