devSpec:yacc: We now print out the current lex token string

We used some preprocessor logic to enable access to yytext and now
we can have verbose, useful error messages from the parser :)

hcore/deviceManager/deviceSpecp.yy

@@ -25,13 +25,20 @@
 #undef yylex
 #define yylex deviceSpecllex
 
+#ifdef yytext
+#undef yytext
+#endif
+#define yytext deviceSpecltext
+
 // Declare the symbols that our lexer will export.
 int yylex(void);
+extern char* yytext; // Declare yytext to access the current token text
 void yyerror(const char *message)
 {
-	throw std::runtime_error(
+    throw std::runtime_error(
         std::string("deviceSpec parser error: ")
-            + std::string(message));
+            + std::string(message)
+            + " at token: " + std::string(yytext));
 }
 
 %}