Document use of UNRESOLVED results to mark test script crashes

ChangeLog

@@ -9,6 +9,9 @@
 
 	* doc/dejagnu.texi (Invoking runtest): Remove --keep_going and
 	--no_keep_going options.
+	(A POSIX Conforming Test Framework): Document that Tcl errors in
+	test scripts produce UNRESOLVED results as placeholders.
+
 	* doc/runtest.1: Likewise.
 
 	* lib/framework.exp (log_and_exit): Print collected Tcl errors.

doc/dejagnu.texi

@@ -385,6 +385,11 @@ A test depends on a previous test, which has failed.
 
 @item
 The test was set up incorrectly.
+
+@item
+A test script aborts due to a Tcl error.  In this case, the DejaGnu
+framework inserts an @emph{UNRESOLVED} result as a placeholder for an
+unknown number of tests that were not run because the script crashed.
 @end itemize
 
 @table @asis