- Add new symbologies BARCODE_EAN8, BARCODE_EAN_2ADDON,

`BARCODE_EAN_5ADDON`, `BARCODE_EAN13`, `BARCODE_EAN8_CC` and
  `BARCODE_EAN13_CC` as replacements for `BARCODE_EANX`,
  `BARCODE_EANX_CHK` and `BARCODE_EANX_CC` and use in CLI/GUI
  (`BARCODE_EANX` etc. marked as legacy)
- For EAN/UPC accept space as alternative add-on separator to '+',
  and accept GTIN-13 format with & without 2-digit or 5-digit
  add-on (no separator)
- Buffer length of member `errtxt` in `zint_symbol` extended 100
  -> 160 (will be sufficient for eventual translation and
  gs1-syntax-dictionary errors hopefully)
- UPC-E: warn if first digit of 7 (or 8 if check digit given) not
  '0' or '1'
- manual: update for new EAN symbologies and mention EANX now
  legacy but still supported

docs/images/upce.svg

@@ -4,15 +4,15 @@
  <desc>Zint Generated Symbol</desc>
  <g id="barcode" fill="#000000">
   <rect x="0" y="0" width="268" height="313" fill="#FFFFFF"/>
-  <path d="M36 0h4v296.97h-4ZM44 0h4v296.97h-4ZM56 0h8v276.97h-8ZM72 0h4v276.97h-4ZM84 0h4v276.97h-4ZM96 0h8v276.97h-8ZM108 0h4v276.97h-4ZM128 0h4v276.97h-4ZM140 0h12v276.97h-12ZM156 0h4v276.97h-4ZM164 0h8v276.97h-8ZM184 0h4v276.97h-4ZM204 0h4v276.97h-4ZM212 0h4v276.97h-4ZM220 0h4v296.97h-4ZM228 0h4v296.97h-4ZM236 0h4v296.97h-4Z"/>
+  <path d="M36 0h4v296.97h-4ZM44 0h4v296.97h-4ZM52 0h8v276.97h-8ZM68 0h8v276.97h-8ZM84 0h4v276.97h-4ZM96 0h8v276.97h-8ZM108 0h16v276.97h-16ZM128 0h4v276.97h-4ZM140 0h12v276.97h-12ZM156 0h4v276.97h-4ZM164 0h12v276.97h-12ZM184 0h4v276.97h-4ZM192 0h4v276.97h-4ZM200 0h16v276.97h-16ZM220 0h4v296.97h-4ZM228 0h4v296.97h-4ZM236 0h4v296.97h-4Z"/>
   <text x="17.4" y="311.37" text-anchor="end" font-family="OCRB, monospace" font-size="28">
-   1
+   0
   </text>
   <text x="134" y="311.37" text-anchor="middle" font-family="OCRB, monospace" font-size="40">
    123456
   </text>
   <text x="246.6" y="311.37" text-anchor="start" font-family="OCRB, monospace" font-size="28">
-   2
+   5
   </text>
  </g>
 </svg>