1.0.0.2: TRACE :ENCAPSULATE NIL, plus other minor Windows improvements

1.0.0.2: TRACE :ENCAPSULATE NIL, plus other minor Windows improvements
 * Function end breakpoints need single-stepping awareness in
   order to work -- fixes TRACE :ENCAPSULATE NIL on Windows.
 * Add more exception codes to grovel-headers.c, and recognize
   them in HANDLE-WIN32-EXCEPTION -- for now just signal a simple
   error with the exception name as the message,
 * Tweak test-suite to recognize backtrace idiosyncracies on Windows,
   and skip a test that would hang due to non-working timouts.