Allow child logger to share the parent Shell

[jmgate]

INSERT DETAILS HERE.

I can see a use case where it would be reasonable for a user to want to organize their log file hierarchically via child ShellLoggers, while at the same time sharing the Shell of the parent ShellLogger. This could be done via either

1. allowing the child to inherit everything defined in the parent's Shell (environment variables, functions, etc.), or
2. allowing the child to share the parent's Shell.

It might be worthwhile to enable both cases. In the first case, whatever is done in the child won't affect the parent or subsequent children, but in the second case it would.

• What feature change/addition is needed?
• How does this differ from what we currently have?
• Do you have suggestions on implementation?
• What alternative solutions have you considered?
• How has the lack of this feature affected you?
• What are you trying to accomplish?
• What specifically must we demonstrate to call this work complete?