- DOTCODE, QRCODE, RMQR: return warning if ECI or Structured Append used in

GS1 mode, ticket #271
- CLI: improve `getopt_long_only()` processing, printing own message if bad
  arg and returning error if so rather than continuing to process
- manual: MSE typo -> MSI, a few other changes; adjust SVG scaling for PDF
  manual; pandoc 2.19.2

backend/common.c

@@ -78,7 +78,7 @@ INTERNAL void to_upper(unsigned char source[], const int length) {
 
     for (i = 0; i < length; i++) {
         if (z_islower(source[i])) {
-            source[i] = (source[i] - 'a') + 'A';
+            source[i] &= 0x5F;
         }
     }
 }