- Add text_gap option to allow adjustment of vertical gap between

barcode and text
- EMF/EPS/SVG/GUI: ignore BOLD_TEXT for EAN/UPC
- DAFT: up max to 250 chars
- EMF/EPS/SVG: fix addon bars placement/length when text hidden
- Qt backend: use `QFontMetrics::horizontalAdvance()` rather than
  `boundingRect()` to calc text width (seems to be more accurate)
- library: make printf/sprintf() format arg always literal string
- output: fix errtxt nos clash;
  use array for `out_upcean_split_text()` text parts
- raster/vector: smallify addon text printing logic
- frontend: warn if output file and direct options both given;
  add TODO note about `CommandLineToArgvW()` loading shell32.dll
- manual: put HRT options in own section

backend/tests/data/svg/gs1_128_cc_fig12.svg

@@ -244,7 +244,7 @@
       <rect x="332.00" y="32.00" width="6.00" height="68.00" />
       <rect x="340.00" y="32.00" width="2.00" height="68.00" />
       <rect x="344.00" y="32.00" width="4.00" height="68.00" />
-      <text x="174.00" y="115.40" text-anchor="middle"
+      <text x="174.00" y="114.00" text-anchor="middle"
          font-family="Helvetica, sans-serif" font-size="14.0" >
          (00)030123456789012340
       </text>