[issue30362] Launcher add list and list with paths options

[Steve Barnes]

Steve Barnes added the comment:

Latest push still has -0 and -0p options for explicit discovery but also defaults to displaying the list if the requested version is not found. (As well as the default python being marked with a trailing * - I have also removed the less than helpful "default python not found when no pythons were found, (very much a corner case).

I feel that the help text is a little on the long side to include the list as well in response to --help so only added it to match not found use case.

I also feel quite strongly that the option for displaying the discovered paths saves a step or two in locating problem installations.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30362>
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