[autofit] Minor.
[autofit] Fix scaling of HarfBuzz shaping.

* src/autofit/hbshim.c (af_get_char_index): Scale to units per EM.
[autofit] Fix handling of default coverages.

* src/autofit/afglobal.c (af_face_globals_compute_style_coverage):
First handle non-default coverages, then the default coverage of the
default script, and finally the other default coverages.
[autofit] Fix handling of default coverages.

With this commit, the implementation of coverage handling is
completed.

* src/autofit/hbshim.c (af_get_coverage): Exit early if nothing to
do.
Reject coverages which don't contain appropriate glyphs for blue
zones.
[autofit] Thinko.

* src/autofit/hbshim.c (af_get_char_index): Similar to
`af_get_coverage', reject glyphs which are not substituted.
[autofit] Fix Indic scripts.

Split the single, incorrect Indic entry into separate scripts so
that the covered ranges are the same: Bengali, Devanagari, Gujarati,
Gurmukhi, Kannada, Limbu, Malayalam, Oriya, Sinhala, Sundanese,
Syloti Nagri, Tamil, Telugu, and Tibetan.  At the same time, remove
entries for Meetai Mayak and Sharada – the Unicode ranges were
incorrect (and nobody has complained about that), fonts are scarce
for those scripts, and the Indic auto-hinter support is rudimentary
anyways.

* src/autofit/afscript.h: Updated, using AF_CONFIG_OPTION_INDIC and
AF_CONFIG_OPTION_CJK.

* src/autofit/afstyles.h (STYLE_DEFAULT_INDIC): New auxiliary macro.
Use it, together with AF_CONFIG_OPTION_INDIC and
AF_CONFIG_OPTION_CJK, to update.

* src/autofit/afranges.c [AF_CONFIG_OPTION_INDIC]: Updated.
[!AF_CONFIG_OPTION_INDIC, !AF_CONFIG_OPTION_CJK]: Removed.
Sort entries by tags.
[autofit] Minor fixes for `afblue.pl'.

* src/tools/afblue.pl (aux_name): Don't use `reverse'.
<Handling #endif>: Use proper indentation for generated `#else'.

* src/autofit/afblue.h: Regenerated.
Fix Savannah bug #41105 (typo in file `README').
Add manual page for `freetype-config'.
Contributed by Nis Martensen <nis.martensen@web.de>.

* docs/freetype-config.1: New file.

* builds/unix/unix-def.in (mandir): Define.
* builds/unix/install.mk (install, uninstall): Handle manpage.