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CODE128: reduce extended latch cut-off from 5 to 4 for better

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encodation in certain cases (and no pessimizations found so far),
  props lyngklip (BWIPP);
  fix extended char latching when exactly 3 extended chars at end;
  count code set C (not digits) in loop deciding when to
  shift/latch to extended for better estimate
AZTEC: return warning if ECC < 5% (due to bit-stuffing when version
  given); return error if > 22 layers (Zint 26) for Reader
  Initialisation symbol requested for better error message
AZTEC/HANXIN/QRCODE: consolidate different ECC data size tables
  into one indexed by ECC
DBAR_EXP: check for reduced length <= 77 up front for better error
  message
HANXIN: use `malloc()` rather than `z_alloca()` for large binary
  array
QRCODE: `ecc_level` now 0-based (not 1-based)
MICROQR: consolidate different version end routines into one
  `microqr_end()` and use new `microqr_data` table to simplify code
MICROPDF417: use table for max codewords per column
library: centralize all error messages using new `errtxt()`,
  `errtxtf()`, `errtxt_adj()` funcs that protect `symbol->errtxt`
  from overflow, & try to make error messages more consistent
  thru-out, adding more feedback info to many, & use positional
  args "%n$" in prep for l10n (maybe);
  `is_sane/is_sane_lookup()` -> `not_sane/not_sane_lookup()`,
  returning 1-based position (zero on failure) instead of bool;
  `long` ints -> plain `int` (except those dealing with `ftell()`,
  `fread()` etc) as depend on int being 32-bits already
GUI: in "grpDATF.ui" use "PlainText" rather than "RichText" for
  tracker ratio examples as height of text messing up sometimes
manual: clarify Codablock-F length maximum & add examples
docs: README: pandoc 3.5, Ubuntu 24.04
CMake: use "-Wpedantic" for Clang only as GNU complains about
  `errtxtf()` positional args "%n$"
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docs/manual.html
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@ -332,7 +332,7 @@
<h1 class="title">Zint Barcode Generator and Zint Barcode Studio User
Manual</h1>
<p class="author">Version 2.13.0.9</p>
<p class="date">September 2024</p>
<p class="date">October 2024</p>
</header>
<nav id="TOC" role="doc-toc">
<ul>
@ -5196,12 +5196,15 @@ alt="zint -b CODABLOCKF -d &quot;CODABLOCK F Symbology&quot; --rows=3" />
aria-hidden="true"><code>zint -b CODABLOCKF -d "CODABLOCK F Symbology" --rows=3</code></figcaption>
</figure>
<p>This is a stacked symbology based on Code 128 which can encode
Latin-1 data up to a maximum length of 2725 characters. The width of the
Codablock-F symbol can be set using the <code>--cols</code> option (API
<code>option_2</code>), to a value between 9 and 67. The height (number
of rows) can be set using the <code>--rows</code> option (API
<code>option_1</code>), with a maximum of 44. Zint does not currently
support encoding of GS1 data in Codablock-F symbols.</p>
Latin-1 data up to a maximum length of 2726 symbol characters, meaning
for instance up to 2726 all ASCII characters, or 5452 all numeric, or up
to 1363 all extended ASCII (ISO/IEC 8859-1).</p>
<p>The width of the Codablock-F symbol can be set using the
<code>--cols</code> option (API <code>option_2</code>), to a value
between 9 and 67. The height (number of rows) can be set using the
<code>--rows</code> option (API <code>option_1</code>), with a maximum
of 44. Zint does not currently support encoding of GS1 data in
Codablock-F symbols.</p>
<p>A separate symbology ID (<code>BARCODE_HIBC_BLOCKF</code>) can be
used to encode Health Industry Barcode (HIBC) data which adds a leading
<code>'+'</code> character and a modulo-49 check digit to the encoded