- 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/code128_egrave_bold_box3.svg

@@ -43,7 +43,7 @@
       <rect x="0.00" y="106.00" width="236.00" height="6.00" />
       <rect x="0.00" y="6.00" width="6.00" height="100.00" />
       <rect x="230.00" y="6.00" width="6.00" height="100.00" />
-      <text x="118.00" y="127.40" text-anchor="middle"
+      <text x="118.00" y="126.00" text-anchor="middle"
          font-family="Helvetica, sans-serif" font-size="14.0" font-weight="bold" >
          Égjpqy
       </text>