Add debugging around test execution

src/libexec/jattool-qrun

         warn "failed to initialize logging"
         return 3
     }
+    debug "(pre-source)"
     source "$Body"
+    debug "(past-source)"
     jat__sfinish; tes=$?
+    debug -v tes
     test $tes -gt 1 && die "test indicated invalid results"
     return $tes
 }