When the topic stage has already been configured present the current
configuration and prompt for optional reconfiguration.  While at it,
make the topic stage remote name configurable by the project.

Add the "export-ignore" attribute to all such files.  Remove the
suggestion from the README since this should not be a responsibility
of the including project.

Interactively prompt the user for ~/.ssh/config setup.

Interactively prompt the user with Gerrit setup instructions.

Fetch the hooks right out of the local clone if possible.  Otherwise
fall back to a project-configured remote repository.

Prompt the user to configure user.name and user.email interactively.