For site documentation - reduce number of columns for class index page.

[ci skip]

Rakefile

@@ -297,7 +297,7 @@ task :ci_site_update do
   # Update credits from README.md to about.yml
   system "ruby -lne 'BEGIN { credits = false }; puts $_ if credits; credits = true if /bugfixes by:/; credits = false if /^$/' README.md |ruby -i -le 'credits = STDIN.read; puts ARGF.read.gsub(/(?<=contributors:\n).*?\n\n/m, credits)' ../doc-Build/_data/about.yml" or abort 'Failed to update credits'
   # Setup doxygen to use minimal theme
-  system "ruby -i -pe 'BEGIN { a = {%q{HTML_HEADER} => %q{minimal-header.html}, %q{HTML_FOOTER} => %q{minimal-footer.html}, %q{HTML_STYLESHEET} => %q{minimal-doxygen.css}, %q{HTML_COLORSTYLE_HUE} => 200, %q{HTML_COLORSTYLE_SAT} => 0, %q{HTML_COLORSTYLE_GAMMA} => 20, %q{DOT_IMAGE_FORMAT} => %q{svg}, %q{INTERACTIVE_SVG} => %q{YES}} }; a.each {|k, v| gsub(/\#{k}\s*?=.*?\n/, %Q{\#{k} = \#{v}\n}) }' ../Build/Docs/generated/Doxyfile" or abort 'Failed to setup doxygen configuration file'
+  system "ruby -i -pe 'BEGIN { a = {%q{HTML_HEADER} => %q{minimal-header.html}, %q{HTML_FOOTER} => %q{minimal-footer.html}, %q{HTML_STYLESHEET} => %q{minimal-doxygen.css}, %q{HTML_COLORSTYLE_HUE} => 200, %q{HTML_COLORSTYLE_SAT} => 0, %q{HTML_COLORSTYLE_GAMMA} => 20, %q{DOT_IMAGE_FORMAT} => %q{svg}, %q{INTERACTIVE_SVG} => %q{YES}, %q{COLS_IN_ALPHA_INDEX} => 3} }; a.each {|k, v| gsub(/\#{k}\s*?=.*?\n/, %Q{\#{k} = \#{v}\n}) }' ../Build/Docs/generated/Doxyfile" or abort 'Failed to setup doxygen configuration file'
   system 'cp ../doc-Build/_includes/Doxygen/minimal-* ../Build/Docs' or abort 'Failed to copy minimal-themed template'
   release = ENV['RELEASE_TAG'] || 'HEAD'
   unless release == 'HEAD'