fix implementation of ABORT, ABORT" and QUIT

testfiles/abort.f

@@ -0,0 +1,4 @@
+: foo abort" Aborting!" ." Did not abort" ;
+
+1 foo
+0 foo

testfiles/combinedtest.f

@@ -1712,6 +1712,7 @@ T{ CHAR " PARSE 4567 "DUP ROT ROT EVALUATE -> 5 4567 }T
 TESTING PARSE-NAME  (Forth 2012)
 \ Adapted from the PARSE-NAME RfD tests
 
+\ XXX this was missing from the test suite, added!
 : STR1 S" abcd" ;
 : STR2 S" abcde" ;