This resolves warning during compile time ``` GEN Doxyfile-gi GEN Doxyfile.stamp warning: Tag 'COLS_IN_ALPHA_INDEX' at line 1076 of file 'Doxyfile' has become obsolete. To avoid this warning please remove this line from your configuration file or upgrade it using "doxygen -u" GEN Doxyfile-gi.stamp warning: Tag 'COLS_IN_ALPHA_INDEX' at line 1076 of file 'Doxyfile-gi' has become obsolete. ```

You can view, comment on, or merge this pull request online at:

https://github.com/geany/geany/pull/2975

-- Commit Summary --

* <a href="https://github.com/geany/geany/pull/2975/commits/1cc2c62f3a4158dc051b98096d13bc5f29105e79">Upgrade Doxyfile.in removing deprectated options</a>

-- File Changes --

M doc/Doxyfile.in (736)

-- Patch Links --

https://github.com/geany/geany/pull/2975.patch https://github.com/geany/geany/pull/2975.diff