Added a test case that runs almost all the tsheg bars from all

non-reference, publicly available ACIP files (hundreds of megabytes of
them) through the converter.  The frequencies of these tsheg bars in
in the file, too.

source/org/thdl/tib/text/ttt/TParseTree.java

@@ -317,7 +317,7 @@ class TParseTree {
                         if (warningLevel == "All")
                             return "Warning: The last stack does not have a vowel in the ACIP {" + ((null != originalACIP) ? originalACIP : recoverACIP()) + "}; this may indicate a typo, because Sanskrit, which this is (because it's not legal Tibetan), should have a vowel after each stack.";
                     } else {
-                        throw new Error("Can't happen now that we stack greedily");
+                        return "Warning: Trying to stack non-consonants."; // DLC
                     }
                 }
             }