Warn when nesting ranger

Users frequently request that launching ranger in a subshell started
from ranger (using `S`) instead exits the subshell so they end up in
their original ranger instance without nesting, which is rarely useful.
This isn't possible because a process can't easily kill its parent
shell.

To at least avoid such confusion we warn about nesting by default.
A new setting `nested_ranger_warning` is added to `rc.conf`. The warning
can be either disabled or the severity increased so the message is more
visible.

Fixes #1645

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