Embed JVMSetupError inside TopLevelException datatype. #1075
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This means that JVMSetupError exceptions can now be caught by
the standard TopLevelException handlers, and get shown with
the expected stack traces in the saw-script REPL.
This is done using a new existentially-typed
SomeTopLevelException
constructor, as recommended by the Control.Exception documentation.
Fixes #1021.