update formatted documentation; fix typo in bashline.c; update system-dependent tests

tests/exec3.sub

@@ -25,10 +25,17 @@ cd $TDIR || exit 1
 
 shopt -s execfail
 
-trap 'echo EXIT' EXIT 
+trapsort()
+{
+	trap > x.output
+	sort x.output && rm -f x.output
+}
+
+trap 'rm -f x.sh x.output ; echo EXIT' EXIT 
 trap 'echo USR1' USR1
 trap '' TERM
-trap
+
+trapsort
 
 kill -s USR1 $$		# should run the trap
 
@@ -94,7 +101,7 @@ case $string in
 esac
 rm -f x.sh x.output
 
-trap
+trapsort
 kill -s USR1 $$		# should run the trap
 kill -s TERM $$		# should still be ignored