parseaut: better error recovery for dstar automata

* src/parseaut/parseaut.yy: Here.
* src/tests/parseaut.test: More tests.

src/tests/parseaut.test

@@ -962,6 +962,48 @@ State: 1
 this is complete garbage!
 --END--
 and even more garbage
+DRA v2 explicit
+Comment: "Safra[NBA=2]"
+States: 2
+garbage  /* <<--- */
+Acceptance-Pairs: 1
+Start: 0
+AP: 1 "a"
+---
+State: 0
+Acc-Sig:
+0
+1
+State: 1
+Acc-Sig: +0
+0
+1
+more garbage
+DRA v2 explicit
+Comment: "Safra[NBA=2]"
+States: 2
+Acceptance-Pairs: 1
+Start: 0
+AP: 1 "a"
+---
+State: 0
+Acc-Sig:
+0
+1
+State: 1
+Acc-Sig: +0
+0
+1
+HOA: v1
+States: 1
+Start: 0
+AP: 0
+Acceptance: 1 Inf(0)
+--BODY--
+State: 0 {0}
+[t] 0
+--END--
+garbage
 EOF
 
 se='syntax error, unexpected'  # this is just to keep lines short
@@ -972,10 +1014,14 @@ input:11.2: $se identifier
 input:11.1-3: ignoring this invalid label
 input:21.5-7: $se string, expecting integer
 input:25.1: $se \$undefined
-input:25.1-12: ignoring leading garbage
 input:32.1-5: $se header name, expecting --END-- or State:
 input:28.1-8: initial state 0 has no definition
+input:25.1-12: leading garbage was ignored
 input:37.1: $se 't'
+input:43.1: $se \$undefined
+input:56.1: $se \$undefined, expecting State: or end of DSTAR automaton
+input:37.1-39.21: leading garbage was ignored
+input:81.1: $se \$undefined
 autfilt: failed to read automaton from input
 EOF