versionable header for sim65

load and run address now configured from header
fix error codes not to conflict with test
fix test/misc/endless.c which is supposed to fail if an endless loop does not occur

src/sim65/error.c

@@ -69,7 +69,21 @@ void Error (const char* Format, ...)
     vfprintf (stderr, Format, ap);
     putc ('\n', stderr);
     va_end (ap);
-    exit (EXIT_FAILURE);
+    exit (SIM65_ERROR);
+}
+
+
+
+void ErrorCode (int Code, const char* Format, ...)
+/* Print an error message and die with the given exit code */
+{
+    va_list ap;
+    va_start (ap, Format);
+    fprintf (stderr, "Error: ");
+    vfprintf (stderr, Format, ap);
+    putc ('\n', stderr);
+    va_end (ap);
+    exit (Code);
 }
 
 
@@ -83,5 +97,5 @@ void Internal (const char* Format, ...)
     vfprintf (stderr, Format, ap);
     putc ('\n', stderr);
     va_end (ap);
-    exit (EXIT_FAILURE);
+    exit (SIM65_ERROR);
 }